Material for collecting volatile organic compounds

Abstract

To simultaneously collect and analyze a volatile organic compound group containing carbonyl compounds which can be contained in a space.SOLUTION: A collector 10 capable of passively collecting a volatile organic compound group from a space includes a collecting material 12 filled in a container 11 having air permeability, and openings at both ends of the container 11 are sealed by a first plug body 13 and a second plug body 14, respectively. The collecting material 12 includes: a granular first porous material which is inactive to the volatile organic compound group and is capable of capturing the volatile organic compound group in a detachable manner; and a granular second porous material which is mixed with the first porous material, is inactive to the volatile organic compound group, and is treated with a reactive compound capable of generating a vaporizable derivative by a reaction with a carbonyl compound. An example of the first porous material is active carbon, and an example of the second porous material is a silica gel treated with a reactive compound ortho-(2, 3, 4, 5, 6-pentafluorobenzyl ester)hydroxylamine.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a collection material, and in particular to a collection material capable of collecting volatile organic compounds including carbonyl compounds that may be contained in air. [Background technology]

[0002] Outdoor and indoor air may contain trace amounts of volatile organic compounds due to pollution from exhaust gases from various factories and volatile gases from building materials, and people living in such air may suffer from poor health due to exposure to volatile organic compounds. In particular, buildings such as schools and houses often use chemical products and organic solvents such as adhesives, paints, and preservatives in building materials and furniture, and are becoming more airtight, so volatile organic compounds tend to remain in the indoor space, which causes the onset of so-called sick house syndrome, including headaches, respiratory diseases, dizziness, eczema, and fatigue, becoming a problem.

[0003] In light of this, the Ministry of Education, Culture, Sports, Science and Technology has specified six types of volatile organic compounds - formaldehyde, toluene, xylene, paradichlorobenzene, styrene and ethylbenzene - as inspection items in its school environmental hygiene standards (Non-Patent Document 1), and the Ministry of Land, Infrastructure, Transport and Tourism has specified formaldehyde as a required item for newly constructed homes, and four types of volatile organic compounds - toluene, xylene, styrene and ethylbenzene - as optional inspection items in its housing quality labeling system based on the Law Concerning the Promotion of Housing Quality Assurance (Non-Patent Document 2).

[0004] In the assessment of volatile organic compounds in indoor spaces such as schools and homes, air samples are collected from the indoor spaces and analyzed. However, the amount of volatile organic compounds that may be present in indoor spaces is generally measured in μg / m 3Because the amounts are so minute, direct analysis of volatile organic compounds contained in air collected from indoor spaces at the levels specified in the indoor concentration guideline values ​​(January 17, 2019, Pharmaceutical and Food Safety Bureau, Ministry of Health, Labour and Welfare, Notification No. 0117-1) is extremely difficult even with highly sensitive separation and analysis methods such as gas chromatography, and even if analysis were possible, doubts remain about the reliability of the analysis results.

[0005] Therefore, in the analysis of volatile organic compounds in indoor spaces, a method is adopted in which volatile organic compounds in the indoor space are collected and the collected volatile organic compounds are analyzed. As a method for collecting volatile organic compounds, a filter capable of collecting volatile organic compounds is generally used. Known methods include a method in which the air in the space is sucked in by a pump and passed through a filter to actively collect the volatile organic compounds (active method), and a method in which a filter is placed in the space and the volatile organic compounds are passively collected on the filter by utilizing the principle of diffusion of substances in the space (passive method). Although the active method can collect the necessary amount of volatile organic compounds for analysis in a short time, it requires a suction pump to be installed indoors, which requires large-scale work and specialized skills, and furthermore, since the suction pump requires electricity, the applicable locations are limited, which is uneconomical. In contrast, the passive method requires a long time to collect the necessary amount of volatile organic compounds for analysis, but since it only requires placing a filter in an indoor space, there is little need to rely on specialized technicians, and there are fewer limitations on where it can be used, making it more advantageous from an economic standpoint than the active method.

[0006] As a filter for the passive method, Patent Document 1 discloses a filter in which a first filter filled with a porous carbon-based adsorbent and a second filter filled with silica gel impregnated with 2,4-dinitrophenylhydrazine are connected. This filter can collect toluene and the like in the space in the first filter, and can collect carbonyl compounds such as formaldehyde in the space in the second filter, so that it is possible to simultaneously collect multiple volatile organic compounds contained in the space. However, it is necessary to extract the toluene and the like captured by the first filter with carbon disulfide and analyze them using a gas chromatograph such as GC / MS, and to extract the formaldehyde and the like captured by the second filter with acetonitrile and analyze them using a high-performance liquid chromatograph. In other words, when using this filter, the volatile organic compounds captured by the first filter and the second filter are extracted and analyzed separately, and the process from collection to analysis of the volatile organic compounds becomes complicated and tedious, requiring numerous instruments, reagents, devices, and labor. [Prior art documents] [Non-patent literature]

[0007] [Non-Patent Document 1] Ministry of Education, Culture, Sports, Science and Technology, School Environmental Hygiene Management Manual: Theory and Practice of "School Environmental Hygiene Standards", [Revised Edition 2018] [Non-Patent Document 2] Guide to the Housing Performance Indication System for Newly Built Homes, supervised by the Ministry of Land, Infrastructure, Transport and Tourism's Housing Bureau, Housing Production Division [Patent documents]

[0008] [Patent Document 1] JP 2003-294592 A Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention is intended to enable simultaneous collection and analysis of a group of volatile organic compounds, including carbonyl compounds, which may be contained in the air. [Means for solving the problem]

[0010] The present invention relates to a trapping material capable of trapping volatile organic compounds including carbonyl compounds that may be contained in a space. The trapping material includes a granular first porous material that is inactive to the volatile organic compounds and capable of detachably trapping the volatile organic compounds, and a granular second porous material that is mixed with the first porous material and that is treated with a reactive compound that is inactive to the volatile organic compounds and capable of generating a vaporizable derivative by reacting with the carbonyl compounds.

[0011] In the collection material of the present invention, the reactive compound is, for example, ortho-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine or a salt thereof, or pentafluorophenylhydrazine.

[0012] The group of volatile organic compounds that can be captured by the capture material of the present invention includes, for example, toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, tetradecane, formaldehyde, and acetaldehyde, and may further include 2-ethyl-1-hexanol, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

[0013] The adsorbent of the present invention can simultaneously capture a group of volatile organic compounds including carbonyl compounds that may be contained in the space. The group of volatile organic compounds captured by the adsorbent can be simultaneously analyzed by gas chromatography if extracted with a solvent.

[0014] The present invention according to another aspect relates to a collector capable of passively collecting volatile organic compounds from a space in order to analyze volatile organic compounds including carbonyl compounds that may be contained in the space.

[0015] A first embodiment of the collector of the present invention relating to this aspect comprises a breathable container and the trapping material of the present invention disposed within the container.

[0016] The collector of the present invention according to the first embodiment can passively collect volatile organic compounds including carbonyl compounds that may be contained in the space by using a collector through a container, and the volatile organic compounds collected by the collector can be simultaneously analyzed by gas chromatography by extracting them from the collector using a solvent.

[0017] A second form of the collector of the present invention relating to this aspect comprises a cylindrical first container having one closed end and the other open end, the first container comprising a granular first porous material that is inactive against volatile organic compounds and capable of detachably capturing the volatile organic compounds; a cylindrical second container having one closed end and the other open end, the second container comprising a granular second porous material that is inactive against volatile organic compounds and has been treated with a reactive compound capable of producing a vaporizable derivative by reaction with a carbonyl compound; a tube that connects the first container and the second container between their respective open ends and is capable of moving the first container or the second container inside toward the other container; and a membrane that divides the inside of the tube into a first container side and a second container side, the membrane being broken when the first container or the second container is moved toward the other container to allow communication between the first container and the second container, wherein the first container or the second container is breathable.

[0018] In the collector of the present invention according to the second embodiment, the reactive compound of the second porous material is, for example, ortho-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine or a salt thereof, or pentafluorophenylhydrazine.

[0019] In one embodiment of the collector of the present invention according to the second aspect, at least one of the first container, the second container and the tube has a portion in the internal space where the cross-sectional area perpendicular to the axial direction varies.

[0020] In the collector of the present invention according to the second embodiment, when the first container or the second container is moved inside the tube toward the other container, the membrane inside the tube breaks, and the inside of the first container and the inside of the second container are connected through the tube. This allows the first porous material and the second porous material to be mixed, and when the mixture is placed in the first or second container having gas permeability, the container forms a collector corresponding to the collector according to the first embodiment of the present invention. This collector can passively collect volatile organic compounds including carbonyl compounds that may be contained in the space at the same time. The volatile organic compounds collected by this collector can be simultaneously analyzed by gas chromatography by extracting them from the collection material with a solvent.

[0021] According to yet another aspect, the present invention relates to a kit for passively collecting volatile organic compounds from a space in order to analyze the volatile organic compounds, including carbonyl compounds, that may be contained in the space.

[0022] A first form of the kit of the present invention relating to this aspect comprises a collector for volatile organic compounds of the first form of the present invention which comprises a container and a collector, and a package which seals the container and is capable of resealing the container after it has been opened and removed, and the inside of the package before opening is filled with a gas which is inert to the collector.

[0023] In the collection kit of the first embodiment of the present invention, when the packaging is opened and the collector is separated, the collector can simultaneously passively collect volatile organic compounds including carbonyl compounds that may be contained in the space, and by resealing the collector container in the packaging after collecting the volatile organic compounds, the collected volatile organic compounds can be stably stored.

[0024] A second form of the kit of the present invention relating to this aspect comprises a volatile organic compound collector of the second form of the present invention in which the first container or the second container is breathable, and a packaging body that seals at least the breathable container of the first or second container and is capable of resealing the container that has been opened and removed.

[0025] In the collection kit of the present invention according to the second embodiment, a collector corresponding to the collector of the present invention according to the first embodiment can be formed in a first or second container having breathability by mixing a first porous material with a second porous material, and when the package is opened and the collector is separated, the separated first or second container can simultaneously passively collect volatile organic compounds including carbonyl compounds that may be contained in the space. Then, when the first or second container after collecting the volatile organic compounds is resealed in the package, the collected volatile organic compounds can be stably stored.

[0026] Yet another aspect of the present invention relates to a method for collecting volatile organic compounds from a space using a collection material for volatile organic compounds according to the present invention, the collection material including a first porous material and a second porous material, in order to analyze volatile organic compounds that may be contained in the space. The method includes the steps of placing the collection material in a breathable container, leaving the container with the collection material placed in it in the space, and recovering the container after leaving it there.

[0027] In one embodiment of this collection method, when collecting volatile organic compounds from a space, a first porous material and a second porous material are mixed to prepare a collection material, and the prepared collection material is placed in a container.

[0028] In this collection method according to the present invention, the collection material for volatile organic compounds according to the present invention is placed in a container and left in space, so that volatile organic compounds including carbonyl compounds that may be contained in the space can be passively collected by the collection material through the container.

[0029] According to yet another aspect, the present invention relates to a method for analyzing volatile organic compounds collected by the collection method of the present invention, which uses an adsorbent placed in a breathable container. This analysis method includes the steps of extracting the volatile organic compounds collected in the adsorbent with a solvent to obtain an extract, and analyzing the extract by gas chromatography.

[0030] In one aspect of this method, carbon disulfide is used as a solvent to extract the volatile organic compounds, hi one embodiment of this aspect, the solvent comprises acetone.

[0031] In the analytical method according to the present invention, the volatile organic compounds collected in the collection material in the method for collecting volatile organic compounds according to the present invention are extracted with a solvent, and therefore the collected volatile organic compounds can be simultaneously analyzed by gas chromatography.

[0032] According to yet another aspect, the present invention relates to a method for collecting volatile organic compounds from a space using a collection kit for volatile organic compounds according to the first embodiment of the present invention, which includes a collector having a breathable container and a collection material, and a packaging for sealing the container, in order to analyze volatile organic compounds that may be contained in the space. This collection method includes a step of opening the packaging to separate the collector, a step of leaving the collector separated from the packaging in the space, and a step of recovering the collector after being left thereunto, and in the step of recovering the collector, the container is resealed in the packaging.

[0033] This collection method according to the present invention uses the collection kit of the first form according to the present invention, and therefore can passively collect volatile organic compounds including carbonyl compounds that may be contained in the space at the same time using a collector, and by resealing the container of the collector after collecting the volatile organic compounds in a packaging body, the collected volatile organic compounds can be stably stored.

[0034] In still another aspect, the present invention relates to a method for collecting volatile organic compounds from a space, using a collector according to a second embodiment of the present invention, which comprises a first container containing a first porous material, a second container containing a second porous material, a tube connecting the first container and the second container and capable of moving the first container or the second container inside toward the other container, and a membrane dividing the inside of the tube into a first container side and a second container side, and in which the first container or the second container is breathable, in order to analyze volatile organic compounds that may be contained in the space, and a collection kit for volatile organic compounds according to the second embodiment of the present invention, which comprises a packaging body that seals at least the breathable container of the first container or the second container.

[0035] This collection method includes step 1 of opening the packaging and separating the packaging and the collector, step 2 of moving the first container or the second container in the collector separated from the packaging towards the other container to damage the membrane, and repeatedly transferring the first porous material of the first container and the second porous material of the second container to the other container in turn through the tube to mix the first and second porous materials to prepare a collection material, and placing the prepared collection material in either the first or second container which has breathability, step 3 of leaving the collector in space after step 2, and step 4 of recovering the collector after being left therein, and in step 4, the container which has breathability of the first or second container is resealed in the packaging with the collection material placed therein.

[0036] This collection method according to the present invention uses the collection kit of the second embodiment of the present invention, and therefore can simultaneously passively collect volatile organic compounds including carbonyl compounds that may be contained in a space by the collector of the present invention of the first embodiment formed from a breathable first container or second container, and the collected volatile organic compounds can be stably stored by resealing the first container or second container after collecting the volatile organic compounds in a package.

[0037] According to yet another aspect, the present invention relates to a method for analyzing volatile organic compounds that may be contained in a space and that have been collected using any of the methods for collecting volatile organic compounds according to the present invention, in which the container of the collector that has been left in a space is resealed in a package and collected. This analysis method includes the steps of opening the package and separating the collected collector, extracting the volatile organic compounds collected in the collector separated from the package with a solvent to obtain an extract, and analyzing the extract by gas chromatography.

[0038] This analytical method according to the present invention is a method for collecting volatile organic compounds according to the present invention that uses a collector separated from a packaging body, and since the volatile organic compounds collected in the collector are extracted with a solvent, the collected volatile organic compounds can be simultaneously analyzed by gas chromatography. Effect of the Invention

[0039] According to the present invention in each aspect, it is possible to simultaneously collect volatile organic compounds including carbonyl compounds that may be contained in the space, and simultaneously analyze the collected volatile organic compounds. [Brief description of the drawings]

[0040] [Figure 1] 1 is a partial vertical sectional front view of a collector for volatile organic compounds according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a partial vertical sectional front view of one embodiment of a collection kit for volatile organic compounds using a collector of the first embodiment. [Diagram 3] FIG. 5 is a vertical sectional front view of a collector for volatile organic compounds according to a second embodiment of the present invention. [Figure 4] FIG. 6 is an exploded vertical sectional front view of a tube forming a collector of a second embodiment. [Diagram 5] FIG. 11 is a vertical cross-sectional front view of a collector of a second embodiment in the process of preparing the trapping material. [Figure 6] FIG. 11 is a vertical sectional front view of one embodiment of a collection kit for volatile organic compounds using a collector of the second embodiment. [Figure 7]FIG. 1 is a schematic diagram of an experimental apparatus used in experimental examples. [Figure 8] Chromatogram showing the results of Experimental Example 1. [Figure 9] 1 is a graph showing the relationship between the amount of toluene adsorbed and the exposure concentration×exposure time in Experimental Example 2. [Figure 10] Graph showing the results of Experimental Example 3. [Figure 11] 13 is a graph showing the results for collector A3 in Experimental Example 4. [Figure 12] 13 is a graph showing the results for collector B in Experimental Example 4. [Figure 13] 13 is a graph showing the results of SR calculated in Experimental Example 5. [Figure 14] Graph showing the results of Experimental Example 6. [Figure 15] 13 is a binarized image of an image captured in Experimental Example 7. [Figure 16] FIG. 13 is a graph showing the comparison results (H / Hmax) of Shannon entropy in Experimental Example 7. [Figure 17] Graph showing the results of Experimental Example 8. [Figure 18] Graph showing the results of Experimental Example 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] A collector for volatile organic compounds according to a first embodiment of the present invention will be described with reference to Fig. 1. In the figure, a collector 10 is capable of passively collecting volatile organic compounds, including carbonyl compounds, from an indoor space of a house, school, lodging facility, or various factories, in order to analyze the volatile organic compounds, including carbonyl compounds, that may be contained in the space. The collector 10 includes a container 11 having air permeability and elasticity, and a collector 12 filled in the container 11. The container 11 is a cylindrical member with both ends open, and is manufactured by sintering or melting an aggregate of resin particles, such as polyethylene resin, polypropylene resin, polyester resin, or fluororesin, or metal particles, such as stainless steel, to such an extent that the particles can adhere to each other, or by weaving and molding, so that gas molecules in the space can pass through by molecular diffusion.

[0042] It is preferable to select a fluororesin that does not generate volatile organic compounds from itself as the material forming the container 11. Examples of the fluororesin that can be used include tetrafluoroethylene resin, tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin, tetrafluoroethylene-hexafluoropropylene copolymer resin, vinylidene fluoride resin, trifluoroethylene resin, trifluoroethylene-ethylene copolymer resin, and vinyl fluoride resin.

[0043] The openings at both ends of the container 11 can be hermetically sealed by a first plug 13 and a second plug 14, which are detachable. The first plug 13, which can hermetically seal one opening of the container 11, is an integrated unit of a handle 15, a cylindrical first plug 16 that can be press-fitted into the opening of the container 11, and a second plug 17 provided between the handle 15 and the first plug 16. The handle 15, the first plug 16, and the second plug 17 are formed in a concentric cylindrical shape, and the second plug 17 has a larger diameter than the first plug 16, and the handle 15 has a larger diameter than the second plug 17. The handle 15 has a through hole 18 for passing a string for suspending the collector 10 in a space from which volatile organic compounds are to be collected.

[0044] The second plug 14 capable of tightly plugging the other opening of the container 11 is formed in a cylindrical shape that can be press-fitted into the opening of the container 11 .

[0045] Both the first stopper 13 and the second stopper 14 are preferably formed using a resin material that does not easily generate volatile organic compounds from itself, in particular, a resin material or glass that does not easily generate the volatile organic compounds to be analyzed. Examples of such resin materials include polypropylene resin, polyethylene resin, polyester resin, acrylic resin, and fluororesin. Fluororesins that can be used are the same as the fluororesins used to form the container 11.

[0046] The trapping material 12 is for trapping volatile organic compounds in the space, and includes a first porous material and a second porous material mixed with the first porous material. The first porous material is a granular material that is inactive to volatile organic compounds and can detachably trap the volatile organic compounds, such as granular activated carbon, graphite carbon, or resin. Such a first porous material is usually capable of trapping volatile organic compounds by adsorbing them. As the granular resin, for example, beads made of diphenylphenylene oxide resin can be used.

[0047] The first porous material is preferably one having an average particle size of 30 to 1,500 μm, more preferably 200 to 1,000 μm, and more preferably one having a specific surface area of ​​30 to 2,000 m, in order to smoothly capture volatile organic compounds and to facilitate desorption of the captured volatile organic compounds using a solvent. 2 / g, especially 300~1,800m 2 / g is preferable, where the specific surface area is determined by the BET method.

[0048] The second porous material is a granular base material that is inactive to volatile organic compounds and is treated with a reactive compound. The base material may be, for example, a resin-based adsorbent such as silica gel, alumina, activated carbon, graphite carbon, or polystyrene beads.

[0049] The reactive compound used in the treatment of the substrate is capable of generating a volatile derivative by reacting with a carbonyl compound. As such a reactive compound, for example, ortho-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (hereinafter sometimes referred to as "PFBHA") or its salt, or pentafluorophenylhydrazine (hereinafter sometimes referred to as "PFPH") can be used. As the salt of PFBHA, for example, hydrochloride, nitrate, phosphate, sulfate, etc. can be used, but hydrochloride is preferred.

[0050] The reaction between a carbonyl compound and PFBHA is shown in formula (1). In formula (1), R 1 and R 2 are organic groups such as hydrocarbon groups or hydrogen and may be the same or different. The reaction produces two isomeric oximes, which are volatile derivatives.

[0051] [ka]

[0052] The reaction between a carbonyl compound and PFPH is shown in formula (2). In formula (2), R 1 and R 2 are either an organic group such as a hydrocarbon group or hydrogen and may be the same or different. The reaction produces two isomeric hydrazones, which are volatile derivatives.

[0053] [ka]

[0054] The second porous material can usually be prepared by mixing the reactive compound dissolved in a solvent with the substrate, thoroughly stirring the mixture, and then removing the solvent so that the substrate is thoroughly dried. The mixing ratio of the reactive compound to the substrate varies depending on the type of reactive compound used, but is preferably set to 0.5 to 5% by mass.

[0055] The particle size of the substrate is usually 30 to 1,500 μm, and preferably 100 to 1,000 μm. The specific surface area of ​​the substrate is usually 10 to 1,500 m. 2 / g, especially 20 to 1,000m 2 / g is preferable. Here, the specific surface area is determined by the BET method. If the substrate and the specific surface area are outside the above range, the reactivity between the reactive compound and the carbonyl compound contained in the volatile organic compound group may decrease, or the generated volatile derivative may become difficult to desorb from the substrate.

[0056] The trapping material 12 can be prepared by mixing the first and second porous materials using a mixer such as a ribbon blender, a drum mixer, or a vortex mixer. In the trapping material 12, the mixing ratios of the first and second porous materials are preferably set to 35-65% and 65-35%, respectively, on a mass basis, more preferably 40-60% and 60-40%, and particularly preferably 50% each. If this mixing ratio is outside the above range, the trapping efficiency of the volatile organic compounds may decrease, and the accuracy of the intended analysis may decrease.

[0057] The first and second porous materials are preferably mixed homogeneously. If the first and second porous materials are mixed unevenly, the collection efficiency and analysis accuracy of the volatile organic compounds may decrease. For example, the derivative of the carbonyl compound generated on the second porous material has a vaporizing property and may diffuse into the space. However, if the second porous material is mixed homogeneously with the first porous material, the generated derivative is easily captured by the first porous material and is less likely to diffuse into the space.

[0058] Since the first porous material and the second porous material are easy to achieve a homogeneous mixed state, it is preferable to use materials with similar bulk densities or to select materials with a shape that is less likely to flow when filled into container 11 as a mixture.

[0059] The collector 10 can be produced by pouring the trapping material 12 into the container 11 from one opening of the container 11 while sealingly sealing the other opening by pressing in the second plug 14, and then sealing the other opening by pressing in the first plug portion 16 of the first plug 13. In this case, the amount of trapping material 12 filled in the container 11 is preferably set in the range of 300 to 1,000 mg when the container 11 has an inner diameter of 2 to 10 mm and a length of about 30 to 100 mm, so that as few voids as possible are generated in the container 11 after the openings at both ends are sealed with the first plug 13 and the second plug 14.

[0060] When collecting volatile organic compounds contained in a given space using collector 10 prepared by filling and arranging trapping material 12 in container 11 as described above, collector 10 is placed in the space and left for a given period of time. Collector 10 can be placed in the space by hanging it in the space by a string passed through through hole 18 of handle 15.

[0061] The collector 10 can collect volatile organic compounds in the air by collecting the volatile organic compounds in the air with the collection material 12. The volatile organic compounds that can be collected by the collector 10 are those designated as inspection items in the School Environmental Hygiene Standards and the Housing Quality Labeling System, that is, volatile organic compounds including toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, tetradecane, and the carbonyl compounds formaldehyde and acetaldehyde, but if the volatile organic compounds further include 2-ethyl-1-hexanol, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, these can also be collected.

[0062] The volatile organic compounds contained in the space diffuse in the space, pass through the container 11 of the collector 10 that is placed stationary, and diffuse into the trapping material 12. Of the volatile organic compounds diffused into the trapping material 12, carbonyl compounds, i.e., formaldehyde and acetaldehyde, react with reactive compounds in the second porous material to generate volatile derivatives on the second porous material. These derivatives are retained on the second porous material, and a portion of the volatilized compounds is captured by the first porous material. Volatile organic compounds other than carbonyl compounds are captured by adsorption to the first porous material. As a result, the volatile organic compounds in the space are captured by the trapping material 12.

[0063] The collector 10 used in collecting volatile organic compounds is preferably one prepared by preparing a collecting material 12 when collecting volatile organic compounds from a space and placing this collecting material 12 in a container 11. The collecting material 12 prepared by mixing a first porous material and a second porous material is likely to lose its reactivity with carbonyl compounds over time because reactive compounds in the second porous material tend to migrate to the first porous material, and this may make it difficult to collect carbonyl compounds among the volatile organic compounds contained in the space; however, when such a collector 10 is used, the ability to collect carbonyl compounds in the space is less likely to be impaired.

[0064] In the analysis of the volatile organic compounds collected by the collector 10, the volatile organic compounds collected in the collector 10 are first extracted. Specifically, the first stopper 13 is removed from the container 11 of the collector 10, and the volatile organic compounds collected in the collection material 12 in the container 11 are extracted with a solvent. That is, the volatile organic compounds adsorbed in the first porous material and the derivative of the carbonyl compound generated in the second porous material are extracted at once with the solvent. Here, for example, the collection material 12 in the container 11 is transferred to a test tube and a solvent is added thereto to obtain an extract. At this time, it is preferable to promote the elution of the volatile organic compounds collected in the collection material 12 by shaking the test tube or applying ultrasonic waves to the test tube. The extract may be separated from the collection material 12 by filtration as necessary and stored in a sample bottle.

[0065] Next, the volatile organic compounds contained in the obtained extract are analyzed by gas chromatography such as gas chromatography-mass spectrometry (GC / MS). Since the volatile organic compounds other than the carbonyl compounds contained in the extract and the derivatives of the carbonyl compounds are all volatile, all of them can be analyzed simultaneously by applying an appropriate amount of the extract to gas chromatography.

[0066] As the solvent for extracting the volatile organic compounds, various solvents can be selected as long as they can dissolve the volatile organic compounds and are applicable to gas chromatography, but it is preferable to use carbon disulfide. When the extract obtained using carbon disulfide as the extraction solvent is applied to gas chromatography, the peak of carbon disulfide in the chromatogram is unlikely to overlap with the peaks of the individual volatile organic compounds and derivatives of carbonyl compounds, so that the reliability of the analysis results can be improved.

[0067] In addition, the carbon disulfide used as the extraction solvent is particularly preferably one containing acetone. The acetone contained in this extraction solvent reacts with unreacted reactive compounds, such as PFBHA or PFPH, which can be extracted from the second porous material together with the volatile organic compounds, so that the peaks of the reactive compounds are unlikely to appear in the chromatogram obtained by analyzing the extract, and the peaks of the reactants of the reactive compounds and acetone are unlikely to overlap with the peaks of the derivatives of the individual volatile organic compounds and carbonyl compounds, so that the reliability of the analysis results can be further improved. The content of acetone in the extraction solvent is usually preferably set to about 5 to 30 mass% so as not to impair the extraction efficiency of the volatile organic compounds.

[0068] The collector 10 may be provided as a collection kit for volatile organic compounds in order to enhance stability during storage and to prevent contamination of the volatile organic compounds in the environment after collection. An example of such a collection kit is shown in Fig. 2. In Fig. 2, the collection kit 1 mainly includes the collector 10 and a storage case 20 (an example of a packaging body).

[0069] The storage case 20 is a cylindrical member capable of storing the container 11 of the collector 10, has an opening 21 at one end, and is closed at the other end formed in a cone shape. The opening 21 has an inner diameter that is approximately the same as the outer diameter of the second plug portion 17 of the first plug body 13, and the second plug portion 17 can be press-fitted into the opening 21. The storage case 20 is formed using glass or resin so that the inside is kept airtight when the opening 21 is closed. As the resin material, it is preferable to use a resin material that does not easily generate volatile organic compounds from itself, in particular, a resin material that does not easily generate the volatile organic compounds to be analyzed. Examples of the relevant resin material include polypropylene resin, polyethylene resin, polyester resin, acrylic resin, and fluororesin. The fluororesin that can be used is the same as the fluororesin used to form the container 11 of the collector 10.

[0070] In the collection kit 1, the collector 10 is housed in the storage case 20 from the second plug 14 side of the container 11 through the opening 21, and the second plug 17 is press-fitted into the opening 21 of the storage case 20 so that the end face of the handle 15 of the first plug 13 abuts on the edge of the opening 21. This results in the container 11 of the collector 10 being airtightly sealed within the storage case 20. The inside of the storage case 20 that houses the container 11 is filled with an inert gas such as nitrogen, argon, or helium, which prevents the collector 10 from being contaminated by volatile organic compounds during storage before use.

[0071] When collecting volatile organic compounds contained in a predetermined space using the collection kit 1, the collector 10 is separated from the storage case 20 in the space. Here, the handle 15 of the first plug 13 is pinched to pull out the second plug 17 from the opening 21 of the storage case 20, and the container 10 together with the second plug 14 is removed from the storage case 20. The separated collector 10 is then left to stand in the space and left for a predetermined time. The collector 10 can be left to stand by passing a string through the through hole 18 of the handle 15 and suspending it in the space by the string.

[0072] After the collector 10 is left for a predetermined time, the container 11 is accommodated in the storage case 20 from the second plug 14 side, the second plug portion 17 is pressed into the opening 21 of the storage case 20, the end face of the handle portion 15 is abutted against the edge of the opening 21, and the container 11 is resealed in the storage case 20 to collect the volatile organic compounds. This prevents the volatile organic compounds collected in the collection material 12 from volatilizing into the atmosphere, and also prevents contamination by volatile organic compounds contained in the outside air. That is, the collection material 12 in the container 11 can be stably stored in a state that substantially maintains the state at the time of collection. Note that, when the necessary parts of the collector 10 and the storage case 20 are formed using a resin material or glass that does not easily emit volatile organic compounds, the composition and amount of the volatile organic compounds collected in the collection material 12 are less likely to change, and the collection material 12 that has collected the volatile organic compounds can be more stably stored.

[0073] In the analysis of the volatile organic compounds collected by the collector 10, the collector 10 collected in the storage case 20 is separated from the storage case 20 in the manner described above. The volatile organic compounds collected in the separated collector 10 are then extracted with a solvent in the manner described above, and the volatile organic compounds contained in the extract thus obtained are analyzed by gas chromatography such as gas chromatography-mass spectrometry (GC / MS).

[0074] Since the collection kit 1 is made using the collection material 12 prepared by mixing the first porous material and the second porous material, it is preferable to use the collection kit 1 for collecting volatile organic compounds promptly, preferably within a few days, from the time of preparation of the collection material 12.

[0075] The collection kit 1 in the above-described embodiment has the container 11 of the collector 10 airtightly housed in the storage case 20, but the collection kit may also be one in which the entire collector 10 is housed in a packaging bag having a zipper that can close the opening airtightly, for example.

[0076] A collector for volatile organic compounds according to a second embodiment of the present invention will be described with reference to Fig. 3. The collector of this embodiment is capable of preparing a collector therein when collecting volatile organic compounds from a space. In Fig. 3, the collector 100 of this embodiment is capable of passively collecting volatile organic compounds from the space described above in order to analyze the volatile organic compounds including carbonyl compounds that may be contained in the space, and mainly comprises a first container 110 containing a first porous material 111, a second container 120 containing a second porous material 121, and a pipe 130 for connecting the first container 110 and the second container 120.

[0077] The first container 110 is formed in a generally cylindrical shape with one end (upper end in the figure) closed and an opening 112 at the other end (lower end in the figure) which is connected to the pipe body 130, and has a through hole 113 at the closed end for passing a string for suspending the collector 100 in the space from which volatile organic compounds are to be collected. The first container 110 also has a threaded portion 114 formed on the outer periphery approximately near the center in the length direction (vertical direction in the figure). Furthermore, the first container 110 has a variable portion 116 of cross-sectional area perpendicular to the axial direction in the internal space 115. The variable portion 116 is formed in a tapered shape in which the cross-sectional area gradually decreases from the closed end side toward the opening 112.

[0078] The first container 110 is non-breathable and made of a resin material or glass. The resin material is preferably a resin material that does not easily generate volatile organic compounds from itself, particularly a resin material that does not easily generate the volatile organic compounds to be analyzed. Examples of the resin material include polypropylene resin, polyethylene resin, polyester resin, acrylic resin, and fluororesin. The fluororesin that can be used is the same as the fluororesin used to form the container 11.

[0079] The first porous material 111 is similar to the first porous material that is one element of the trapping material 12 used in the trap 10 of the first embodiment, and is housed in the internal space 115 of the first container 110 .

[0080] The second container 120 is a cylindrical member having air permeability, with one end (the lower end in the figure) closed and the other end (the upper end in the figure) connected to the tube 130 having an opening 122, and is manufactured by the same method and using the same material as the container 11 forming the collector 10 of the first embodiment so that gas molecules in the space pass through by molecular diffusion. The opening 122 has a screw groove 123 formed on its inner circumferential surface. The second porous material 121 is the same as the second porous material that is one element of the trapping material 12 used in the collector 10 of the first embodiment, and is housed in the internal space 124 of the second container 120.

[0081] 4, the pipe 130 mainly includes a main body 131 and an adapter 132. The main body 131 and the adapter 132 are non-breathable and made of the same resin material or glass as that forming the first container 110.

[0082] The main body 131 is a cylindrical member with both ends open, and has individual screw grooves 133, 134 on the inner circumferential surface of each end. One of the screw grooves 133 corresponds to the screw portion 114 of the first container 110.

[0083] The adaptor 132 is a cylindrical member for connecting the second container 120 to the main body 131, and has a screw portion 135 formed on the outer peripheral surface at one end thereof corresponding to the other screw groove 134 of the main body 131, and has a screw portion 136 formed on the outer peripheral surface at the other end thereof corresponding to the screw groove 123 of the second container 120. The adaptor 132 has a variable portion 138 of a cross-sectional area perpendicular to the axial direction in an internal space 137. The variable portion 138 is formed at the boundary between the screw portion 135 and the screw portion 136, and is formed in a tapered shape in which the cross-sectional area gradually decreases from the screw portion 135 side toward the screw portion 136. The adaptor 132 also has a flange portion 139 protruding perpendicular to the axial direction at the boundary between the screw portion 135 and the screw portion 136.

[0084] The main body 131 has a membrane 140 disposed deep inside the screw groove 134. The membrane 140 is a crushable thin film that divides the inside of the main body 131 into a screw groove 133 side that serves as a connecting portion for the first container 110 and a screw groove 134 side that serves as a connecting portion for the adapter 132. The material of the membrane 140 is not particularly limited as long as it is stable with respect to the first porous material and the second porous material, and examples of the material include a laminated sheet of aluminum foil and paper, a polyolefin resin sheet such as a polyethylene resin sheet, a fluororesin sheet such as a polytetrafluoroethylene resin sheet, a silicone resin sheet coated with polytetrafluoroethylene resin, aluminum foil and paper, etc.

[0085] The tube 130, in which the main body 131 and the adapter 132 are integrated by screwing the screw portion 135 into the screw groove 134, is connected to the first container 110 by screwing the screw portion 114 of the first container 110 into the screw groove 133. At this time, as shown in FIG. 3, the screwing amount of the screw portion 114 into the screw groove 133 is adjusted so that the opening 112 of the first container 110 gently abuts against the membrane body 140. In addition, the tube 130 is connected to the second container 120 by screwing the screw groove 123 of the second container 120 into the screw portion 136 so that the flange portion 139 of the adapter 132 is in close contact with the opening 122 of the second container 120. As a result, the first container 110 and the second container 120 are connected through the tube 130.

[0086] When collecting volatile organic compounds contained in a predetermined space using the collector 100, the first porous material 111 and the second porous material 121 are mixed in the collector 100 to prepare a collecting material similar to that used in the collector 10 of the first embodiment. Here, as shown in FIG. 3, the collector 100 is in an upright state, and the screw portion 114 of the first container 110 is further screwed into the screw groove 133 of the tube 130, thereby crushing the membrane 140 to communicate the internal space 115 of the first container 110 with the internal space 124 of the second container 120 through the tube 130. As a result, as shown by the arrow in FIG. 5, the first porous material 111 contained in the first container 110 flows out from the opening 112 and falls into the second container 120 through the tube 130. After the entire amount of the first porous material 111 has fallen into the second container 120, the collector 100 is turned upside down like an hourglass, and the entire amount of the first porous material 111 that has fallen into the second container 120 is allowed to fall into the first container 110 through the tube 130. At this time, the entire amount of the second porous material 121 in the second container 120 also falls into the first container 110 together with the first porous material 111. By repeatedly turning the collector 100 upside down in this manner, the first porous material 111 and the second porous material 121 are mixed, and the desired collection material is prepared.

[0087] In the process of repeatedly turning the collector 100 upside down, the first porous material 111 and the second porous material 121 moving between the first container 110 and the second container 120 pass through the fluctuating portion 116 of the first container 110 and the fluctuating portion 138 of the tube 130 while falling, and a difference in flow rate occurs between the peripheral portion and the central portion of the flow path. That is, a difference in the falling speed occurs between the peripheral portion and the central portion of each of the fluctuating portions 116, 138, and this difference causes the first porous material 111 and the second porous material 121 to mix together. Therefore, when the collector 100 is repeatedly turned upside down, the first porous material 111 and the second porous material 121 are mixed uniformly.

[0088] Furthermore, in the process of preparing the trapping material, it is only necessary to repeatedly turn the trapping device 100 upside down, and the safety of the worker can be ensured since there is no need for the worker to touch the first porous material 111 and the second porous material 121. For example, if the second porous material 121 is treated with the hydrochloride of PFBHA, the hydrochloride is highly acidic and therefore dangerous for the worker to touch, but even in such a case, the safety of the worker can be ensured.

[0089] In collecting volatile organic compounds using collector 100 with prepared trapping material, collector 100 is placed in a space with the trapping material placed in breathable second container 120, and after leaving it for a predetermined time, collector 100 is retrieved. Collector 100 can be placed in a space by hanging it in the space by a string passed through through hole 113 of first container 110.

[0090] In the analysis of the volatile organic compounds collected by the collector 100, first, the second container 120 is separated from the collector 100, and the volatile organic compounds collected in the collection material in the second container 120 are extracted with a solvent in the manner described above to obtain an extract. Then, the volatile organic compounds contained in the obtained extract are analyzed by gas chromatography such as gas chromatography-mass spectrometry (GC / MS).

[0091] The collector 100 may be provided as a collection kit for volatile organic compounds in order to enhance stability during storage and to prevent contamination of the volatile organic compounds in the environment after collection. An example of such a collection kit is shown in Fig. 6. In Fig. 6, the collection kit 1A mainly includes the collector 100 and a storage case 200 (an example of a packaging body).

[0092] The storage case 200 is a cylindrical member capable of storing the entire second container 120 and the tubular body 130 of the collector 100 and a part of the first container 110, and has an opening 210 at one end and a closed other end. The inner diameter of the opening 210 is approximately the same as the outer diameter of the upper part of the first container 110 in the figure, and is airtightly sealed by an O-ring 220 arranged on the outer circumferential surface of the first container 110 when the collector 100 is stored in the storage case 200. The storage case 200 is formed using glass or resin so that the inside is kept airtight when the opening 210 is sealed. As the resin material, it is preferable to use a resin material that does not easily generate volatile organic compounds from itself, in particular, a resin material that does not easily generate the volatile organic compounds to be analyzed. Examples of the relevant resin material include polypropylene resin, polyethylene resin, polyester resin, acrylic resin, and fluororesin. The fluororesin that can be used is the same as the fluororesin used to form the container 11 of the collector 10 of the first embodiment.

[0093] The inside of the storage case 200 that stores the collector 100 may be filled with an inert gas, similar to the case of the collection kit 1.

[0094] When collecting volatile organic compounds contained in a predetermined space using the collection kit 1A, the collector 100 is separated from the storage case 200 in the space. Here, the upper part of the first container 110 is pinched and the entire collector 100 is pulled out from the opening 210 of the storage case 200. Then, in the collector 100 separated in this way, the first porous material 111 and the second porous material 121 are mixed in the manner described above to prepare a collection material, and this collection material is placed in the second container 120. Next, the collector 100 prepared in this way is placed in a predetermined space and left for a predetermined time. The collector 100 can be placed in a space by passing a string through the through hole 113 of the first container 110 and hanging it in the space by the string.

[0095] After being left for a predetermined time, the collector 100 is stored in the storage case 200 in its original state from the second container 120 side, and the opening 210 of the storage case 200 is airtightly sealed again with the O-ring 220 to collect the volatile organic compounds. This prevents the volatile organic compounds collected in the collection material from volatilizing into the atmosphere, and also prevents contamination by volatile organic compounds contained in the outside air. That is, the collection material in the collector 100 can be stably stored in a state that substantially maintains the state at the time of collection. If the necessary parts of the collector 100 and the storage case 200 are formed using a resin material or glass that does not easily emit volatile organic compounds, the composition and amount of the volatile organic compounds collected in the collection material are less likely to change, and the collection material that has collected the volatile organic compounds can be stored more stably.

[0096] In the analysis of the volatile organic compounds collected by the collector 100, the collector 100 collected in the storage case 200 is separated from the storage case 200 in the manner described above. The volatile organic compounds collected in the separated collector 10 are then extracted with a solvent in the manner described above, and the volatile organic compounds contained in the extract thus obtained are analyzed by gas chromatography such as gas chromatography-mass spectrometry (GC / MS).

[0097] Since the collection kit 1A can prepare a collection material by mixing the first porous material 111 and the second porous material 121 in the collector 100 when collecting volatile organic compounds from space, the collection kit 1A can be stored for a longer period of time than the collection kit 1 using the first form of collector 10.

[0098] In the second embodiment, the collector 100 accommodates the first porous material 111 in the first container 110 and the second porous material 121 in the second container 120, but the second porous material 121 may be accommodated in the first container 110 and the first porous material 111 in the second container. In addition, the collector 100 has one variable portion 116 and one variable portion 138 in the first container 110 and the tube 130, respectively, but more similar variable portions may be provided, or may be provided in the second container 120. In addition, the variable portion may not be tapered, but may be provided in a step shape with one or more steps.

[0099] [Experimental Example] The trapping materials, traps, experimental equipment, etc. used in the following experimental examples are as follows. First porous material: Spherical activated carbon (Kureha Corporation's product name "BAC", average particle size: approx. 700 μm, specific surface area: approx. 1,300 m 2 100 mL of 0.1 M hydrochloric acid was mixed with 40 g of activated carbon (100 g / g), and the spherical activated carbon was washed for 20 minutes using an ultrasonic cleaner. The washed spherical activated carbon was subjected to suction filtration and repeatedly washed with water until the filtrate became neutral. After washing, the spherical activated carbon was transferred to a beaker and completely dried in a vacuum dryer, and this was used as the first porous material.

[0100] Second porous material: 20 g of silica gel (trade name "Wako Gel C-100" by Fujifilm Wako Pure Chemical Industries, Ltd.) was placed in a glass container, and 100 mL of 2-propanol was added and stirred. After stirring, the mixture was left to stand for about 5 minutes to confirm that the silica gel had precipitated, and the supernatant was discarded to wash the silica gel. Meanwhile, 300 mg of PFBHA hydrochloride was dissolved in a mixture of 80 mL of 2-propanol and 20 mL of distilled water, and 20 mg of phosphoric acid was added to this solution to prepare a reactive compound solution.

[0101] The entire amount of the washed silica gel was mixed with the entire amount of the reactive compound solution, and the mixture was stirred at a rotation speed of 500 rpm for 5 minutes using a magnetic stirrer. The mixture was transferred to a rotary evaporator, and the silica gel was dried under reduced pressure. The silica gel was then transferred to a beaker and heated and dried in an oven at 80°C for 16 hours or more, and used as the second porous material.

[0102] Collection material: The first and second porous materials were mixed homogeneously in the amounts shown in Table 1 to prepare six types of adsorption materials (adsorption materials 1 to 6).

[0103] [Table 1]

[0104] Collector A1~A6: A collector corresponding to collector 10 according to the first embodiment shown in Fig. 1 was produced in the following manner. A porous tube (outer diameter 6 mm, inner diameter 5 mm) made of tetrafluoroethylene resin with a length of 8 cm was used as container 11, and an opening at one end of this container 11 was sealed by pressing in a second plug body 14 made of tetrafluoroethylene resin. Then, the entire amount (600 mg) of any one of the trapping materials 1 to 6 was poured into the opening at the other end of container 11 using a funnel, and the opening was sealed by pressing in a first plug portion 16 of a first plug body 13 made of tetrafluoroethylene resin, thereby producing six types of collectors (collectors A1 to A6) shown in Table 2.

[0105] [Table 2]

[0106] Collector B: Using the same container 11, first plug 13, and second plug 14 as those used in the collectors A1 to A6, a collector B was produced as a comparison object for the collectors A1 to A6, in which a first porous material and a second porous material were laminated instead of a collection material, in the following manner. The opening at one end of the container 11 was sealed by pressing in a second plug 14 made of tetrafluoroethylene resin. 150 mg of the first porous material was poured into the opening at the other end of the container 11 using a funnel, and a disk-shaped partition made of tetrafluoroethylene resin was inserted and placed on top of it. Next, 350 mg of the second porous material was poured onto the partition from the same opening, and the opening was sealed by pressing in a first plug portion 16 of a first plug 13 made of tetrafluoroethylene resin.

[0107] Experimental equipment: An exposure test device capable of controlling the amount of volatile organic compounds generated was used as the experimental device for evaluating the performance of collectors A1 to A6 and collector B. The schematic configuration of the exposure test device used is shown in FIG. 7. The exposure test device 20 comprises a glass chamber 30 (manufactured by AGC Technoglass Co., Ltd.) and an introduction device 40 for volatile organic compounds. The chamber 30 is an airtight container placed on a magnetic stirrer 31 and has a fan 32 at the bottom that can be rotated by the magnetic stirrer 31. The fan 32 is for generating an airflow in the internal space of the chamber.

[0108] The introduction device 40 includes an introduction path 41 for volatile organic compounds extending into the chamber 30, and the introduction path 41 branches into two paths, a first path 42 and a second path 43. The first path 42 extends from a first gas cylinder 44 filled with compressed air, and includes a permeator 45 (manufactured by Gastec Corporation) for generating volatile organic compounds and a first mass flow controller 46 (model number "FCS-T1000L" by Fujikin Corporation) in this order, and is connected to the introduction path 41 downstream of the first mass flow controller 46. The second path 43 extends from a second gas cylinder 47 filled with compressed air, and branches into two paths, a dry path 48 and a wet path 49. The dry path 48 is connected to the introduction path 41 via a second mass flow controller 50 (model number "FCS-T1000L" by Fujikin Corporation), and can supply dry air from the second gas cylinder 47 to the first path 42. The wet path 49 includes a third mass flow controller 51 (model number "FCS-T1000L" by Fujikin Corporation) and an impinger 52 filled with water, in this order, and the downstream side of the impinger 52 is connected to the second path 43. The wet path 49 humidifies the air from the second gas cylinder 47 by passing it through the impinger 52, generating moist air.

[0109] <Experimental Example 1> A collector A3 was suspended from the top in the chamber 30 (reference numeral 10 in FIG. 7). On the other hand, a diffusion tube filled with toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, tetradecane, 2-ethyl-1-hexanol, formaldehyde, and acetaldehyde as volatile organic compounds was installed in the permeator 45 to generate gas of the volatile organic compounds, which was sent from the first path 42 to the introduction path 41 by air from the first gas cylinder 44. In addition, air was sent from the second gas cylinder 47, a part of which was sent as dry air to the introduction path 41 through the dry path 48, and the remaining part was sent as wet air to the introduction path 41 through the wet path 49. Then, the air from each path mixed in the introduction path 41 was supplied into the chamber 30. At this time, the flow rate in each path was controlled by the first mass flow controller 46, the second mass flow controller 50, and the third mass flow controller 51, and the amount and humidity of the volatile organic compounds in the air supplied to the chamber 30 from the introduction path 41 were controlled. In addition, the fan 32 was rotated by the magnetic stirrer 31 to adjust the wind speed in the chamber 30.

[0110] The air supplied to the chamber 30 from the introduction path 41 was adjusted to a temperature of 25°C and a relative humidity of 50%, and the wind speed in the chamber 30 was set to 0.05 m / sec. The collector A3 was left for any time between 8 hours and 24 hours to be exposed to the air in the chamber 30 containing the volatile organic compounds. The collector A3 was then removed from the chamber 30, and the collector was transferred to a test tube. Carbon disulfide containing 20% ​​by mass of acetone was added as an extraction solvent to the test tube, and ultrasonic waves were applied to extract the volatile organic compounds collected by the collector. The chromatogram of the obtained extract analyzed by gas chromatography-mass spectrometry is shown in FIG. 8.

[0111] 8, it can be seen that formaldehyde and acetaldehyde contained in the volatile organic compounds in the air introduced into chamber 30 are each collected by the collector A3 as derivatives produced by reaction with PFBHA together with other volatile organic compounds such as toluene, and can be simultaneously analyzed by gas chromatography. In addition, the PFBHA used to collect formaldehyde and acetaldehyde produces a reaction product with acetone contained in the extraction solvent, and this reaction product appears as a unique peak in the chromatogram, so it can be seen that it is unlikely to affect the analysis results of the volatile organic compounds.

[0112] <Experimental Example 2> The sampling rate (SR) of each volatile organic compound by the collector A3 was calculated. SR is the collection speed of each volatile organic compound by the collector A3, and more specifically, it is a coefficient required to convert the amount of the volatile organic compound to be measured collected by the collector A3 into the concentration in the space where the collector A3 is placed.

[0113] In the calculation of SR, an exposure test of the collector A3 was performed with exposure concentration and exposure time as variables. Here, using an experimental device, the collector A3 was exposed to air containing volatile organic compounds by the same method as in Experimental Example 1. At this time, the temperature was 25°C, the relative humidity was 50%, and the wind speed was 0.05 m / sec. The exposure concentration was set to low, medium, or high concentration with reference to the indoor concentration guideline value, and the exposure time was 8 hours, 16 hours, or 24 hours for each exposure concentration, so that the collector A3 was exposed under nine different conditions. The volatile organic compounds collected in the exposed collector A3 were extracted and analyzed by gas chromatography-mass spectrometry in the same manner as in Experimental Example 1, and the SR was calculated by investigating the relationship between the adsorption amount of each volatile organic compound and the exposure concentration x exposure time. The results for toluene as a representative example of a volatile organic compound are shown in Figure 9. According to Figure 9, toluene has an SR of 0.115 L / min, and there is good linearity (coefficient of determination R exceeding 0.99) between the adsorption amount and the exposure concentration x exposure time. 2 ) is obtained.

[0114] For other volatile organic compounds, the relationship between the amount of adsorption and the exposure concentration x exposure time was examined in the same manner as for toluene, and the SR was calculated, and the results are shown in Table 3. Table 3 also shows the results for toluene.

[0115] [Table 3]

[0116] According to Table 3, the coefficient of determination R for the relationship between the amount of adsorption and the exposure concentration × exposure time for volatile organic compounds other than toluene was the same as for toluene. 2 A good linearity of more than 0.99 was obtained. This shows that the collector A3 can collect volatile organic compounds contained in the space over a wide concentration range, and can quantify each collected volatile organic compound with high accuracy.

[0117] The SR calculated in the following experimental example was calculated according to this experimental example, although there were changes in the relative humidity and exposure time.

[0118] <Experimental Example 3> Collector B was used instead of collector A3, and collector B was exposed to the air in chamber 30 containing volatile organic compounds in the same manner as in Experimental Example 1. Then, the first porous material and the second porous material were taken out of collector B into separate test tubes, and the volatile organic compounds collected by each porous material were extracted separately by the same method as in Experimental Example 1, and analyzed in the same manner as in Experimental Example 1. The proportion of each volatile organic compound collected by each porous material in the total amount of each volatile organic compound collected in collector B is shown in Fig. 10.

[0119] FIG. 10 shows that, among the volatile organic compounds, toluene, ethylbenzene, xylene, styrene, and p-dichlorobenzene are mostly captured by the first porous material, while most of the derivatives produced by the reaction of formaldehyde and acetaldehyde with PFBHA are captured by the second porous material, and also that tetradecane and 2-ethyl-1-hexanol are captured by both the first and second porous materials.

[0120] <Experimental Example 4> Collector A3 or collector B was suspended in chamber 30 and exposed to the air in chamber 30 containing the volatile organic compounds in the same manner as in Experimental Example 1. Then, the SR of each volatile organic compound was calculated.

[0121] This experiment was carried out for the collector A3 when the relative humidity in the chamber 30 was set to 10%, 50%, and 85%. Meanwhile, for the collector B, the experiment was carried out when the relative humidity in the chamber 30 was set to 50% and 85%. Also, the volatile organic compounds collected in the collector A3 were extracted and analyzed in the same manner as in Experimental Example 1, and the SR of each volatile organic compound was calculated based on the results. Meanwhile, the volatile organic compounds collected in the collector B were extracted from the first porous material and the second porous material, respectively, and analyzed individually in the same manner as in Experimental Example 3. Then, the amount of each volatile organic compound collected according to each analysis result was added up to obtain the total amount collected by the collector B, and the SR of each volatile organic compound was calculated based on the total amount. The results for the collector A3 are shown in FIG. 11, and the results for the collector B are shown in FIG. 12.

[0122] According to Fig. 11, the effect of the humidity of the space on the SR of the collector A3 is limited, and it can be said that the collector A3 can be applied to collect volatile organic compounds from spaces with a wide range of humidity. In contrast, according to Fig. 12, the SR of tetradecane, formaldehyde, and acetaldehyde significantly decreases in the collector B in the case of high humidity. Although it has been found that tetradecane is collected by both the first and second porous materials in Experimental Example 3, tetradecane is highly hydrophobic, whereas the silica gel base material of the second porous material is prone to hygroscopicity. Therefore, it is considered that the SR decreases due to the decrease in the amount collected by the second porous material under high humidity. In addition, the boiling points of formaldehyde and acetaldehyde are low even after derivatization with PFBHA on the second porous material (169°C for the derivative of formaldehyde with PFBHA, and 198°C for the derivative of acetaldehyde with PFBHA. However, both boiling points are estimated values ​​using EPI-Suit (trademark), a software group developed by the U.S. Environmental Protection Agency (EPA)). Furthermore, silica gel, which is the base material of the second porous material, has a small specific surface area and weak adsorption ability, so that the derivatives are easily re-diffused into the space, which is thought to result in a decrease in SR.

[0123] 11 and 12, the SR of each volatile organic compound is significantly higher when using collector A3 than when using collector B. With collector B, toluene and other volatile organic compounds can be captured substantially by the first porous material alone (see Experimental Example 3), and therefore the effective diffusion area of ​​volatile organic compounds is small, which is thought to be the cause of the low SR. In contrast, with collector A3, volatile organic compounds can be captured by the entire collection material, which is a mixture of the first and second porous materials, and therefore the effective diffusion area is large, which is thought to contribute to the improvement of the SR.

[0124] <Experimental Example 5> One of the collectors A1 to A6 was suspended in the chamber 30 and exposed to the air in the chamber 30 containing the volatile organic compounds in the same manner as in Experimental Example 1, and the SR of each volatile organic compound was calculated. Here, the relative humidity in the chamber 30 was set to 80%, and the exposure time was 24 hours. The results of repeating the same experiment three times are shown in Figure 13. Furthermore, the relative standard deviation (RSD) for the SR of formaldehyde and acetaldehyde is shown in Table 4.

[0125] [Table 4]

[0126] According to FIG. 13, it can be seen that the SR of each volatile organic compound shows different tendencies depending on the mixture ratio of the first porous material and the second porous material in the collector used in the collector. That is, the SR of toluene, ethylbenzene, xylene, styrene, and p-dichlorobenzene, which have poor adsorption ability to silica gel, which is the base material of the second porous material, tends to decrease as the mixture ratio of the first porous material decreases. In addition, the SR of formaldehyde and acetaldehyde is highest in the case of the collector A3, in which the first porous material and the second porous material are mixed in equal amounts in the collector. This is considered to be due to the balance between the reaction efficiency of formaldehyde and acetaldehyde reacting with PFBHA on the second porous material to form derivatives, and the effect of capturing the derivatives generated in the second porous material in the first porous material without diffusing them. Furthermore, when the mixture ratio of the first porous material is large, the SR of formaldehyde and acetaldehyde tends to decrease and the RSD tends to increase. These trends suggest that in order to improve the collection efficiency and analytical accuracy of volatile organic compounds, it is preferable to mix the first and second porous materials in the collection material in as equal amounts as possible.

[0127] <Experimental Example 6> Using the collector A3, the collection kit 1 according to the first embodiment shown in FIG. 1 was prepared in the following manner. The collector A3 was inserted into a glass storage case 20 (capacity 10 mL) from the second stopper 14 side. Then, a tube made of tetrafluoroethylene resin was inserted into the gap between the storage case 20 and the collector A3 from the opening 21, and the tube was fed so that its tip extended to the bottom of the storage case 20. After supplying purified nitrogen gas through the tube into the storage case 20 at a flow rate of 100 mL / min for 30 seconds, the second stopper part 17 of the first stopper 13 was pressed into the opening 21 to seal the storage case 20. The collection kit 1 in which the inside of the storage case 20 was replaced with nitrogen gas in this way was left to stand in an oven set at 50° C. for 24 hours. Thereafter, the collector A3 was taken out of the storage case 20, and volatile organic compounds were extracted from the collection material in the same manner as in Experimental Example 1 and analyzed. In addition, a similar collection kit 1 was created without replacing the atmosphere in the container 20 with nitrogen gas, and was placed in an oven in the same manner, after which volatile organic compounds were extracted and analyzed. The quantitative results of formaldehyde and acetaldehyde are shown in FIG.

[0128] The amount of formaldehyde and acetaldehyde extracted from the collector A3 of the collection kit 1 in which the storage case 20 is not replaced with nitrogen gas is significantly greater than the amount extracted from the collector A3 of the collection kit 1 in which the storage case 20 is replaced with nitrogen gas. In particular, the amount of acetaldehyde extracted from the former exceeds the amount of adsorption when sampling for 24 hours at a concentration of 1 / 100 of the indoor concentration guideline value. This result shows that the blank of formaldehyde and acetaldehyde is higher for the collection kit 1 in which the storage case 20 is not replaced with nitrogen gas than for the collection kit 1 in which the storage case 20 is replaced with nitrogen gas. The former result is presumably due to the generation of formaldehyde and other substances by the oxidation of impurities in the activated carbon, in addition to formaldehyde and other substances that may be released from the activated carbon itself, which is the first porous material used in the collection kit A3.

[0129] Formaldehyde and acetaldehyde have various sources in the measurement space of volatile organic compounds and are often unevenly distributed in the space, so there is a concern that the blank of the collector may affect the analysis results, especially the quantitative results. In addition, it is known that the detection levels of formaldehyde and acetaldehyde in a typical room are roughly a fraction of the indoor concentration guideline values, so in order to improve the analysis accuracy of volatile organic compounds in a room, it is preferable to sufficiently reduce the blank of the collector. Therefore, the results of this experimental example suggest that the collection kit 1 in which the inside of the storage case 20 is replaced with nitrogen gas is advantageous in evaluating volatile organic compounds in a space with higher accuracy.

[0130] <Experimental Example 7> The mixing state of the first and second porous materials in the collection material was compared between the following two modes.

[0131] Aspect 1: In this embodiment, the first porous material and the second porous material were mixed in advance to prepare a trapping material, which was then filled into a glass tube that resembled the container 11 of the collector 10 according to the first embodiment. Specifically, 300 mg of the first porous material and 300 mg of the second porous material were weighed out and poured into the container, and the two materials were shaken together in the container to prepare the trapping material. This trapping material was then filled into a glass tube with an inner diameter of 5 mm and a length of 100 mm, one end of which was closed.

[0132] Aspect 2: In this embodiment, a mixer was created to resemble the collector 100 according to the second embodiment, and the first and second porous materials were mixed in the mixer to prepare a collection material. Specifically, 300 mg of the first porous material was filled in a glass tube with an inner diameter of 5 mm and a length of 100 mm, the same as that used in embodiment 1, and 300 mg of the second porous material was filled in a narrow-mouthed test tube, and the glass tube and the test tube were connected using a resin tube. The tube used here has one part with a variable inner diameter. The mixer created in this way was turned up and down five times in the manner of an hourglass with the glass tube facing down, to mix the first and second porous materials, and the collection material prepared in this way was placed in the glass tube.

[0133] The preparation of the adsorbent according to each of the first and second embodiments was tested three times, and for each test, the dispersibility of the first and second porous materials in the adsorbent inside the glass tube was evaluated by image analysis. First, the glass tube containing the prepared adsorbent was photographed from three directions, and the images were binarized. The binarized images are shown in FIG.

[0134] 15, it can be seen that the first porous material tends to accumulate at the bottom of the glass tube in embodiment 1, whereas the first and second porous materials tend to be dispersed relatively evenly in embodiment 2. The results in embodiment 1 are presumed to be due to the difference in rolling properties between the first and second porous materials, which caused separation of the first and second porous materials when the collection material was filled into the glass tube.

[0135] Next, the binarized image was divided into a 100x100 grid to calculate the density distribution of black pixels, and the dispersion of black pixels was evaluated by Shannon entropy (H). This dispersion was evaluated by comparing the ratio with the Shannon entropy (Hmax) of an ideal dispersion state. Shannon entropy (H) is expressed by the following formula: In the formula, H is the Shannon entropy, and P is the probability that an event E occurs (here, the number of black pixels in each grid / the number of black pixels in the entire binarized image).

[0136]

number

[0137] 16 shows the comparison results (H / Hmax) of the Shannon entropy for each of the embodiment 1 and the embodiment 2. Although there is no significant difference between the embodiment 1 and the embodiment 2, the variation between tests (RSD) was lower in the embodiment 2. This indicates that the embodiment 2 can suppress the variation in the mixture while realizing at least the same mixture as the embodiment 1.

[0138] <Experimental Example 8> The storage performance was examined for the collector 10 according to the first embodiment and the collector 100 according to the second embodiment. Here, a glass tube filled with 300 mg of the collecting material produced in the embodiment 1 of Experimental Example 7, with a plug made of tetrafluoroethylene resin pressed into the opening to seal it, was regarded as equivalent to the collector 10 according to the first embodiment (this will be referred to as the first collector). In addition, as the collector 100 according to the second embodiment, a combination was produced in which a second container 120 made of a porous tube (length 80 mm, outer diameter 6 mm, inner diameter 5 mm) made of tetrafluoroethylene resin was combined with a first container 110 and a tube body 130 both made of acrylic resin (this will be referred to as the second collector). More specifically, the second collector has a first container 110 filled with 300 mg of a first porous material and a second container 120 filled with 300 mg of a second porous material, and the inside of a tube 130 is partitioned by a membrane 140 made of silicone resin coated with polytetrafluoroethylene resin.

[0139] After the first collector was left standing in a thermostatic chamber at 40°C for one day, a carbon disulfide solution with an acetaldehyde concentration of 5,000μg / mL was added to the collector, and the PFBHA hydrochloride in the second porous material was reacted with acetaldehyde. The carbon disulfide solution after the reaction was measured by GC / MS as the test liquid, and the strength of the oxime, which is the reaction product of acetaldehyde and PFBHA hydrochloride, was measured. In addition, the strength of the oxime was measured when the first collector was left standing in a thermostatic chamber at 40°C for 11 days and then treated in the same manner.

[0140] On the other hand, after the second collector was left standing in a thermostatic chamber at 40°C for one day, a carbon disulfide solution with an acetaldehyde concentration of 5,000μg / mL was added to the second porous material in the second container 120, and the PFBHA hydrochloride in the second porous material was reacted with acetaldehyde. The carbon disulfide solution after the reaction was measured by GC / MS as a test liquid, and the strength of the oxime, which is a reaction product of acetaldehyde and PFBHA hydrochloride, was measured. In addition, the strength of the oxime was measured when the second collector was left standing in a thermostatic chamber at 40°C for 11 days and then treated in the same manner.

[0141] Based on the measured oxime strength, the preservation performance of the collection material in the first collector and the preservation performance of the second porous material in the second collector were evaluated in terms of reactivity with acetaldehyde. The preservation performance of each material was evaluated by reacting the second porous material, which had been refrigerated and stored at 4°C, with acetaldehyde in a similar carbon disulfide solution, and measuring the strength of the oxime, which is a reaction product with PFBHA hydrochloride, by GC / MS using the carbon disulfide solution after the reaction as the test liquid, and comparing it with the initial value.

[0142] The results are shown in Figure 17. Figure 17 shows the results of storing each collector at 4°C, assuming that the accelerated test was performed while the collectors were left at 40°C. This conversion is based on the assumption that a 10°C temperature rise causes chemical reactions to proceed twice as fast, as is often the case in accelerated tests to evaluate material deterioration, in accordance with the Arrhenius law. The specific conversion formula is as follows:

[0143]

number

[0144] 17, the reactivity of the second porous material in the trapping material of the first collector decreased to about 70% after 4 days of storage, and to about 20% after 12 days of storage. In contrast, the second porous material in the second collector showed substantially no decrease in reactivity even after 4 days of storage, and maintained its reactivity for a long period of time.

[0145] According to the results of this experimental example, it is preferable that the collector of the first embodiment and the collection kit using said collector are stored in a refrigerator after preparation and used within a few days.

[0146] <Experimental Example 9> A second collector was prepared similar to that prepared in Experimental Example 8. In this second collector, the first container 110 was screwed into the tube 130 to crush the membrane 140, and the second container 120 was turned upside down three times in the manner of an hourglass to mix the first porous material in the first container 110 and the second porous material in the second container 120. The collection material prepared in this way was placed in the second container 120, and this was used as the test device 1.

[0147] The test device 1 was suspended in the chamber 30 with the second container 120 facing downward, and the SR of each volatile organic compound was calculated by the same operation and under the same conditions as in Experimental Example 5. A collector A3 was suspended in the chamber 30 instead of the test device 1, and the SR of each volatile organic compound was calculated in the same manner. The results are shown in FIG.

[0148] As shown in FIG. 18, there is no significant difference in SR between when the test device 1 is used and when the collector A3 is used. Therefore, even when the collector is prepared by mixing the first porous material and the second porous material in the collector 100 of the second form, the collector is expected to have good collection performance for volatile organic compounds.

[0149] This disclosure may contribute to improving living environments through the analysis of volatile organic compounds in indoor spaces such as schools and homes, and may therefore contribute to achieving Goal 3 of the United Nations-led Sustainable Development Goals (SDGs), which is to "ensure good health and well-being for all." [Explanation of symbols]

[0150] 1. 1A Collection Kit 10, 100 collector 11 Container 12 Collection material 20, 200 storage cases 110 1st container 111 First porous material 120 Second container 121 Second porous material 130 Body 138 Variable Part 140 Membrane body

Claims

1. A collection material capable of collecting volatile organic compounds including carbonyl compounds that may be contained in a space, a granular first porous material that is inactive to the volatile organic compounds and capable of detachably capturing the volatile organic compounds; a granular second porous material mixed with the first porous material and treated with a reactive compound that is inactive with respect to the volatile organic compounds and capable of producing a volatile derivative by reaction with the carbonyl compound; A collection material for volatile organic compounds, including

2. 2. The volatile organic compound collector according to claim 1, wherein the reactive compound is ortho-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine or a salt thereof, or pentafluorophenylhydrazine.

3. 3. The volatile organic compound trapping material according to claim 1, wherein the volatile organic compound trapping material comprises toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, tetradecane, formaldehyde and acetaldehyde.

4. 4. The volatile organic compound collector according to claim 3, wherein the volatile organic compound further comprises 2-ethyl-1-hexanol, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

5. A collector capable of passively collecting volatile organic compounds including carbonyl compounds from a space in order to analyze the volatile organic compounds that may be contained in the space, comprising: A breathable container; The trapping material according to claim 1 or 2, which is disposed in the container; A collector for volatile organic compounds.

6. A collector capable of passively collecting volatile organic compounds including carbonyl compounds from a space in order to analyze the volatile organic compounds that may be contained in the space, comprising: a cylindrical first container having one end closed and the other end open, the first container containing a granular first porous material that is inactive to the volatile organic compounds and capable of detachably capturing the volatile organic compounds; a cylindrical second container having one end closed and the other end open, the second container containing a granular second porous material treated with a reactive compound which is inactive against the volatile organic compounds and capable of producing a vaporizable derivative by reacting with the carbonyl compound; a pipe that connects the first container and the second container between their open ends and allows the first container or the second container to be moved inside the pipe toward the other container; a membrane that divides the inside of the tube into a first container side and a second container side, and that breaks when the first container or the second container is moved toward the other container, thereby allowing the first container and the second container to communicate with each other; Equipped with The first container or the second container has breathability. A collector for volatile organic compounds.

7. 7. The collector of claim 6, wherein the reactive compound is ortho-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine or a salt thereof, or pentafluorophenylhydrazine.

8. 8. The collector for volatile organic compounds according to claim 6, wherein at least one of the first container, the second container and the tubular body has a portion in an internal space where the cross-sectional area varies perpendicular to the axial direction.

9. A kit for passively collecting volatile organic compounds including carbonyl compounds from a space in order to analyze the volatile organic compounds that may be contained in the space, comprising: A collector for volatile organic compounds according to claim 5, comprising a container and a collector; a packaging body capable of sealing the container and resealing the container after it has been opened and removed; Equipped with The inside of the package before opening is filled with a gas that is inactive to the trapping material. A collection kit for volatile organic compounds.

10. A kit for passively collecting volatile organic compounds including carbonyl compounds from a space in order to analyze the volatile organic compounds that may be contained in the space, comprising: The collector for volatile organic compounds according to any one of claims 6 to 8, wherein the first container or the second container has gas permeability; a packaging body that seals at least one of the first container and the second container, which is breathable, and that can reseal the container that has been opened and removed; A collection kit for volatile organic compounds.

11. A method for collecting volatile organic compounds from a space using the collection material for volatile organic compounds according to claim 1 or 2, comprising a first porous material and a second porous material, in order to analyze volatile organic compounds that may be contained in the space, the method comprising: placing the trapping material in a gas-permeable container; leaving the container in which the trapping material is placed in the space; Recovering the container after standing; A method for collecting a group of volatile organic compounds including:

12. The method for collecting volatile organic compounds according to claim 11, further comprising the steps of: mixing a first porous material with a second porous material to prepare the collection material when collecting the volatile organic compounds from the space; and placing the prepared collection material in the container.

13. A method for analyzing volatile organic compounds collected by the method according to claim 11 or 12, which uses a collection material placed in a breathable container, comprising: a step of extracting the volatile organic compounds collected in the collection material with a solvent to obtain an extract; Analyzing the extract by gas chromatography; A method for analyzing a group of volatile organic compounds including:

14. The method for analyzing volatile organic compounds according to claim 13, wherein carbon disulfide is used as the solvent.

15. The method for analyzing volatile organic compounds according to claim 14, wherein the solvent comprises acetone.

16. 10. A method for collecting volatile organic compounds from a space using the collection kit for volatile organic compounds according to claim 9, comprising a collector having a breathable container and a collection material, and a packaging body for sealing the container, in order to analyze volatile organic compounds that may be contained in the space, the method comprising: opening the package to separate the collector; leaving the collector separated from the packaging body in the space; A step of recovering the collector after leaving it; Including, resealing the container in the package during the step of retrieving the collector. Methods for sampling volatile organic compounds.

17. 11. A method for collecting volatile organic compounds from a space by using the collection kit for volatile organic compounds according to claim 10, comprising: a first container containing a first porous material, a second container containing a second porous material, a tube connecting the first container and the second container and capable of moving the first container or the second container in the direction of the other container inside, and a membrane dividing the inside of the tube into a first container side and a second container side, the first container or the second container being breathable, in order to analyze volatile organic compounds that may be contained in the space, the method comprising: A step 1 of opening the packaging body and separating the packaging body and the collector; a step 2 of moving the first container or the second container in the collector separated from the packaging body toward the other container to damage the membrane, and repeatedly transferring the first porous material of the first container and the second porous material of the second container to the other container in turn through the tube to mix the first and second porous materials to prepare a trapping material, and placing the prepared trapping material in one of the first and second containers that has air permeability; Step 3 of leaving the collector in the space after step 2; A step 4 of recovering the collector after the standing; Including, In step 4, the breathable container of the first container or the second container is resealed in the package with the trapping material disposed therein. Methods for sampling volatile organic compounds.

18. A method for analyzing volatile organic compounds that may be contained in the space collected by using the method according to claim 16, wherein the container of the collector after being left in the space is resealed in a package and collected, comprising: opening the package and separating the collected collector; extracting the volatile organic compounds collected in the collector separated from the packaging body with a solvent to obtain an extract; Analyzing the extract by gas chromatography; A method for analyzing a group of volatile organic compounds including:

19. A method for analyzing volatile organic compounds that may be contained in the space collected by using the method according to claim 17, wherein the container of the collector after being left in the space is resealed in a package and collected, comprising: opening the package and separating the collected collector; extracting the volatile organic compounds collected in the collector separated from the packaging body with a solvent to obtain an extract; Analyzing the extract by gas chromatography; A method for analyzing a group of volatile organic compounds including:

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