Passive sampling device

Abstract

According to the passive sampling device, a plurality of fixing ring pipes are sequentially arranged in a collecting pipe body in the axial direction of the collecting pipe body, an adsorption slide glass is located in the collecting pipe body and arranged between any two adjacent fixing ring pipes or arranged on the side, back to a collecting pipe opening, of any fixing ring pipe, and therefore the adsorption slide glass can be used for adsorption of the sampling pipe. Before the target gas in the monitoring environment is sampled, the relative position of the adsorption slide glass in the collection tube body can be adaptively adjusted based on the concentration condition of the target gas in the monitoring environment and the standard sampling time, so that the diffusion path of the target gas in the collection tube body is changed; the influence on the monitoring result of the target gas in the monitoring environment is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of atmospheric environment monitoring, and more particularly to a passive sampling device. BACKGROUND

[0002] At present, in the atmospheric environment monitoring, the passive sampling technology mainly uses the adsorption carrier in the sampling device to capture the target gas, so that the target gas concentration in the sampling device forms a gradient difference with the target gas concentration in the monitoring environment, and then the continuous sampling operation of the target gas in the monitoring environment is realized based on the gas diffusion principle.

[0003] However, in the existing passive sampling device, the adsorption carrier is usually packaged and fixed in the sampling device, so that the gas diffusion path in the sampling device is relatively fixed, which cannot be adaptively adjusted according to the different concentrations of the target gas in the monitoring environment, and then it is inconvenient to adaptively adjust the sampling rate of the sampling device to the target gas based on the standard sampling time, which finally affects the monitoring result of the target gas in the monitoring environment. CONTENT OF THE INVENTION

[0004] The application aims to provide a passive sampling device, which aims to solve the problem that the gas diffusion path in the existing passive sampling device is relatively fixed, which cannot be adaptively adjusted according to the different concentrations of the target gas in the monitoring environment, and then it is inconvenient to adaptively adjust the sampling rate of the sampling device to the target gas based on the standard sampling time, which finally affects the monitoring result of the target gas in the monitoring environment.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the application is to provide a passive sampling device, which comprises a collection pipe body, a filter cover body, a sealing cover body, an adsorption carrier and a plurality of fixed ring pipes. One end of the collection pipe body is provided with a collection pipe opening in communication with the outside. The filter cover body is arranged at the collection pipe opening of the collection pipe body and is provided with a filter cover opening in communication with the collection pipe opening. The sealing cover body is used to simultaneously open or close the collection pipe opening and the filter cover opening. The plurality of fixed ring pipes are arranged in the collection pipe body in sequence along the axial direction of the collection pipe body. The adsorption carrier is located in the collection pipe body and is arranged between any two adjacent fixed ring pipes, on one side of any one fixed ring pipe facing the collection pipe opening, or on the other side of any one fixed ring pipe facing away from the collection pipe opening.

[0006] In one of the embodiments, the inner wall of the collection pipe body is provided with a plurality of guide prisms along the axial direction of the collection pipe body. The plurality of guide prisms are distributed equidistantly along the circumference of the collection pipe body in sequence. The edge of the adsorption carrier is provided with a plurality of guide notches. The plurality of guide notches are respectively and one-to-one correspondingly connected to each guide prism along the axial direction of the collection pipe body. The outer wall of the fixed ring pipe is provided with a plurality of guide grooves. The plurality of guide grooves are respectively and one-to-one correspondingly connected to each guide prism along the axial direction of the collection pipe body.

[0007] In one of the embodiments, the adsorption carrier includes an adsorption area and a fixing area arranged around the periphery of the adsorption area, the adsorption area is axially away from each fixing ring tube along the collecting tube body, the fixing area is axially relative to each fixing ring tube along the collecting tube body, the adsorption area has an adsorption coating, and the fixing area is provided with a plurality of guide notches.

[0008] In one of the embodiments, the inner wall of the filter cover is provided with a first flange, the first flange abuts against the end of the collecting tube body provided with the collecting tube opening, the inside of the filter cover is further provided with a plastic filter membrane and a metal screen, the plastic filter membrane and the metal screen are sequentially fixed to the side of the first flange away from the collecting tube opening along the collecting tube body, and the plastic filter membrane is located adjacent to the side of the collecting tube opening, and the metal screen is located away from the side of the collecting tube opening.

[0009] In one of the embodiments, the inner wall of the filter cover is provided with a second flange, the first flange and the second flange are oppositely spaced along the collecting tube body to cooperatively form an annular groove, and the plastic filter membrane and the metal screen are clamped and fixed in the annular groove.

[0010] In one of the embodiments, the outer wall of the end of the collecting tube body adjacent to the collecting tube opening is provided with a first thread, the inner wall of the end of the filter cover adjacent to the collecting tube body is provided with a second thread matched with the first thread to form a threaded connection, and the outer wall of the end of the filter cover adjacent to the collecting tube body is further provided with a friction stripe.

[0011] In one of the embodiments, the minimum diameter of the filter cover opening is 20 mm, the metal screen is a stainless steel screen with a pore size less than 35 mesh, and the plastic filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 5 um.

[0012] In one of the embodiments, the collecting tube body, the filter cover, the sealing cover and each fixing ring tube are all polyethylene parts, and the adsorption carrier is a fiber filter paper with an adsorption coating.

[0013] In one of the embodiments, it further includes a protective cover and a protective screen, the protective cover has a cavity structure inside, the bottom of the cavity structure has an opening communicating with the outside, the top of the cavity structure is provided with an adhesive layer, the protective screen movable cover is arranged on the opening, a plurality of collecting tube bodies and corresponding filter covers are located in the cavity structure, and the ends of the plurality of collecting tube bodies away from the collecting tube openings are respectively adhered and fixed to the adhesive layer.

[0014] The beneficial effect of the sealing structure provided in this application is that, compared with the prior art, the above-mentioned passive sampling device includes a collection tube body, a filter cover, a sealing cover, an adsorption carrier, and multiple fixed ring tubes. One end of the collection tube body has a collection port communicating with the outside. The filter cover is placed over the collection port of the collection tube body and has a filter cover opening communicating with the collection port. The sealing cover is used to simultaneously open the collection port and the filter cover opening, or to simultaneously close the collection port and the filter cover opening. Multiple fixed ring tubes are sequentially arranged inside the collection tube body along its axial direction. The adsorption carrier is located inside the collection tube body and is positioned between any two adjacent fixed ring tubes, or on the side of any fixed ring tube facing away from the collection port. Therefore, before sampling the target gas in the monitoring environment, the relative position of the adsorption carrier inside the collection tube can be adaptively adjusted based on the concentration of the target gas in the monitoring environment and the standard sampling time. This changes the diffusion path of the target gas inside the collection tube. For example, when the concentration of the target gas in the monitoring environment is high, a longer diffusion path can be set to reduce the adsorption rate of the adsorption carrier, thus preventing the adsorption carrier from saturating too early at the standard sampling time. When the concentration of the target gas in the monitoring environment is low, a shorter diffusion path can be set to increase the adsorption rate of the adsorption carrier, so that the adsorption carrier can collect a relatively suitable amount of target gas within the standard sampling time, avoiding affecting the monitoring results of the target gas in the monitoring environment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective structural diagram of the passive sampling device provided in embodiment 1 of this application;

[0017] Figure 2 for Figure 1 A schematic diagram of the front view of the acquisition tube and related structures in the passive sampling device shown;

[0018] Figure 3 for Figure 2 A schematic cross-sectional view of the acquisition tube and related structures shown.

[0019] Figure 4 for Figure 1 A bottom view of the acquisition tube in the passive sampling device shown.

[0020] Figure 5 for Figure 1A schematic view of the bottom structure of the adsorption carrier in the passive sampling device shown.

[0021] Figure 6 For Figure 1 A schematic view of the bottom structure of the fixed ring tube in the passive sampling device shown.

[0022] In the figure: 10, passive sampling device; 100, collection tube body; 101, collection tube opening; 102, guide prism; 200, filter cover; 201, filter cover opening; 202, first flange; 203, second flange; 204, annular groove; 205, friction stripe; 210, plastic filter membrane; 220, metal screen; 300, sealing cover; 400, adsorption carrier; 410, adsorption area; 420, fixed area; 422, guide notch; 500, fixed ring tube; 502, guide groove; 600, protective cover; 601, cavity structure; 602, opening; 610, adhesive layer; 700, protective screen. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0027] Please refer to Figure 1 ,Figure 2 and Figure 3 The passive sampling device 10 provided by the embodiment of the present application comprises a collection tube body 100, a filter cover body 200, a sealing cover body 300, an adsorption carrier 400 and a plurality of fixed ring tubes 500. One end of the collection tube body 100 is coaxially provided with a collection tube port 101 which is connected to the outside for collecting target gas in the monitoring environment. The filter cover body 200 is arranged at the collection tube port 101 of the collection tube body 100 and coaxially provided with a filter cover port 201 which is connected to the collection tube port 101. Thus, the target gas in the monitoring environment enters the collection tube body 100 through the filter cover port 201 and the collection tube port 101 in sequence during the collection process. Before and after the collection operation of the target gas, the sealing cover body 300 covers the filter cover body 200 to simultaneously close the collection tube port 101 and the filter cover port 201. During the collection operation of the target gas, the sealing cover body 300 is separated from the filter cover body 200 to simultaneously open the collection tube port 101 and the filter cover port 201. The plurality of fixed ring tubes 500 are arranged in the collection tube body 100 in sequence along the axial direction of the collection tube body 100. The corresponding adsorption carrier 400 is arranged in the collection tube body 100 and fixed between any two adjacent fixed ring tubes 500, or fixed on one side of any one of the fixed ring tubes 500 facing the collection tube port 101, or fixed on one side of any one of the fixed ring tubes 500 away from the collection tube port 101.

[0028] It should be noted that in the embodiment, the closer the adsorption carrier 400 is to the collection tube port 101 along the axial direction of the collection tube body 100, the shorter the diffusion path of the target gas in the collection tube body 100, and correspondingly, the faster the adsorption speed of the adsorption carrier 400. When the adsorption carrier 400 is fixed on one side of any one of the fixed ring tubes 500 facing the collection tube port 101, the diffusion path of the target gas in the collection tube body 100 reaches a minimum value, and correspondingly, the adsorption speed of the adsorption carrier 400 reaches a maximum value. Conversely, the farther the adsorption carrier 400 is from the collection tube port 101 along the axial direction of the collection tube body 100, the longer the diffusion path of the target gas in the collection tube body 100, and correspondingly, the slower the adsorption speed of the adsorption carrier 400. When the adsorption carrier 400 is fixed on one side of any one of the fixed ring tubes 500 away from the collection tube port 101, the diffusion path of the target gas in the collection tube body 100 reaches a maximum value, and correspondingly, the adsorption speed of the adsorption carrier 400 reaches a minimum value. Figure 2The view angle, in the embodiment, the adsorption carrier 400 is fixedly arranged on the side of the fixed ring tube 500 away from the collection pipe opening 101, that is, the test adsorption carrier 400 is fixedly arranged between the bottom end of the collection pipe body 100 and the fixed ring tube 500, and at this time, the diffusion path of the target gas in the collection pipe body 100 reaches the maximum value, that is, the adsorption speed of the adsorption carrier 400 reaches the minimum value.

[0029] The passive sampling device 10 provided in the application has the beneficial effect that, compared with the prior art, the adsorption carrier 400 in the passive sampling device 10 is located inside the collection pipe body 100 and arranged between any two adjacent fixed ring tubes 500, or arranged on the side of any fixed ring tube 500 facing the collection pipe opening 101, or arranged on the side of any fixed ring tube 500 away from the collection pipe opening 101. Therefore, before sampling the target gas in the monitoring environment, the relative position of the adsorption carrier 400 inside the collection pipe body 100 can be adaptively adjusted based on the concentration of the target gas in the monitoring environment and the standard sampling time, so as to change the diffusion path of the target gas inside the collection pipe body 100. For example, when the concentration of the target gas in the monitoring environment is high, a longer diffusion path is arranged to reduce the adsorption rate of the adsorption carrier 400, so as to prevent the adsorption carrier 400 from being saturated too early at the standard sampling time. When the concentration of the target gas in the monitoring environment is low, a shorter diffusion path is arranged to increase the adsorption rate of the adsorption carrier 400, so that the adsorption carrier 400 can collect a relatively appropriate amount of target gas within the standard sampling time, and the monitoring result of the target gas in the monitoring environment is not affected.

[0030] Please refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 In the embodiment, the inner wall of the collection pipe body 100 is provided with a plurality of guide prisms 102 along the axial direction of the collection pipe body 100, the guide prisms 102 are equidistantly distributed along the axial direction of the collection pipe body 100 in sequence, the edge of the adsorption carrier 400 is provided with a plurality of guide notches 422, the plurality of guide notches 422 are respectively and one-to-one correspondingly connected to the guide prisms 102 along the axial direction of the collection pipe body 100, and the outer wall of the fixed ring tube 500 is provided with a plurality of guide grooves 502, the plurality of guide grooves 502 are respectively and one-to-one correspondingly connected to the guide prisms 102 along the axial direction of the collection pipe body 100.

[0031] It should be noted that in the present embodiment, the guiding connection relationship between the guiding prism 102 and the corresponding guiding notch 422 and the corresponding guiding groove 502 can facilitate the quick disassembly of the adsorption carrier 400 and the fixed ring tube 500 in the collection tube body 100. In addition, after the adsorption carrier 400 and the fixed ring tube 500 are arranged in the collection tube body 100, the adsorption carrier 400 and the fixed ring tube 500 can also be provided with a limiting function, thereby improving the structural stability of the passive sampling device 10.

[0032] Further, in the present embodiment, the adsorption carrier 400 includes an adsorption area 410 and a fixed area 420 arranged around the outer periphery of the adsorption area 410. The adsorption area 410 is axially avoided from each fixed ring tube 500 along the collection tube body 100, and the fixed area 420 is axially relative to each fixed ring tube 500 along the collection tube body 100, that is, the cross-sectional area of the adsorption area 410 is adapted to the inner ring cross-sectional area of the fixed ring tube 500, and the adsorption area 410 has an adsorption coating thereon, and the fixed area 420 is provided with a plurality of guiding notches 422 in the circumferential direction.

[0033] Further, in the present embodiment, the inner wall of the filter cover 200 is coaxially provided with a first flange 202, and the first flange 202 abuts the end of the collection tube body 100 provided with the collection tube port 101 along the axial direction of the collection tube body 100, and further abuts the side of the fixed area 420 of the corresponding adjacent adsorption carrier 400 towards the collection tube port 101 along the axial direction of the collection tube body 100, or abuts the side of the corresponding adjacent fixed ring tube 500 towards the collection tube port 101 along the axial direction of the collection tube body 100. The inside of the filter cover 200 is further provided with a plastic filter membrane 210 and a metal sieve 220, wherein the plastic filter membrane 210 and the metal sieve 220 are fixed to the side of the first flange 202 away from the collection tube port 101 along the axial direction of the collection tube body 100 in sequence, the plastic filter membrane 210 is located adjacent to the collection tube port 101, and the metal sieve 220 is located away from the collection tube port 101. The plastic filter membrane 210 and the metal sieve 220 cooperate to filter the remaining impurities in the monitoring environment and reduce the gas flow rate of the filter cover 201.

[0034] Further, in the present embodiment, the inner wall of the filter cover 200 is provided with a second flange 203, and the first flange 202 and the second flange 203 are arranged in opposite directions along the axial direction of the collection tube body 100. In this way, an annular groove 204 is formed between the first flange 202 and the second flange 203, and the plastic filter membrane 210 and the metal sieve 220 are clamped and fixed in the annular groove 204.

[0035] Further, in the embodiment, the collecting tube 100 is provided with a first thread (not shown in the figure) on the outer wall of one end adjacent to the collecting tube opening 101, and the filter cover 200 is provided with a second thread (not shown in the figure) on the inner wall of one end adjacent to the collecting tube 100, which is adapted to the first thread to form a threaded connection. In addition, the filter cover 200 is also provided with a friction stripe 205 on the outer wall of one end adjacent to the collecting tube 100, so as to facilitate the rotation of the filter cover 200 through the friction stripe 205.

[0036] Further, in the embodiment, the minimum diameter of the filter cover opening 201 is 20 mm, the metal screen 220 is a stainless steel screen with a pore size of less than 35 mesh, the plastic filter membrane 210 is a polytetrafluoroethylene filter membrane with a pore size of 5 um, the collecting tube 100, the filter cover 200, the sealing cover 300 and each fixing ring tube 500 are all polyethylene parts, and the adsorption carrier 400 is a fiber filter paper with an adsorption coating.

[0037] Please refer to Figure 1 and Figure 1 For example, in the embodiment, the passive sampling device 10 further includes a protective cover 600 and a protective screen 700. The protective cover 600 has a cavity structure 601 inside, the bottom of the cavity structure 601 is provided with an opening 602 communicating with the outside, the top of the cavity structure 601 is provided with an adhesive layer 610, and the protective screen 700 is detachably covered on the opening 602. In this way, after removing the corresponding sealing covers 300 of the plurality of collecting tubes 100, the plurality of collecting tubes 100 can be arranged in the cavity structure 601 (the corresponding filter covers 200 connected to each collecting tube 100 are also arranged in the cavity structure 601), and the end of each collecting tube 100 opposite to the collecting tube opening 101 is adhered and fixed to the adhesive layer 610. Then, the protective screen 700 is covered, and the protective cover 600 is hung at a proper position in the monitoring environment, so that each collecting tube 100 is hung upside down, and the protective cover 600 and the protective screen 700 cooperatively cover each collecting tube 100, which can better prevent external dust and other impurities from entering the inside of the collecting tube 100 and interfering with the final detection result.

[0038] Specifically, in the embodiment, the protective screen 700 is detachably covered on the opening 602. In some other embodiments, the protective cover 600 is provided with a plurality of support lugs (not shown in the figure) on the outer wall of one side adjacent to the opening 602, and the protective screen 700 is supported on the plurality of support lugs and covered on the opening 602.

[0039] Furthermore, in this embodiment, the passive sampling device 10 further includes a positioning module (not shown in the figure) and a terminal module (not shown in the figure). The positioning module is located in the cavity structure 601 and is adhered and fixed on the adhesion layer 610 and is communicatively connected to the terminal module. The terminal module is used to receive the real-time positioning information sent by the positioning module, and to issue a reminder alarm when the real-time positioning information sent by the positioning module leaves the preset range. In some other embodiments, the positioning modules are fixedly arranged on the outer wall of each collection tube 100 of the cavity structure 601.

[0040] It should be noted that the theoretical sampling rate of the passive sampling device 10 provided in this application can be calculated based on Fick's first law (1):

[0041] Q=60×D×A / L(1)

[0042] Where Q is the sampling rate (mL / min), and D is the diffusion coefficient of the target gas in air (cm). 2 / s), A is the diffusion cross-sectional area (cm²) 2 L is the diffusion length (cm). Specifically, in this application, the diffusion cross-sectional area A is the inner ring cross-sectional area of ​​the fixed ring tube 500, and the diffusion length L is the distance from the adsorption carrier 400 to the plastic filter membrane 210 along the axial direction of the collection tube 100. The diffusion length L can be calculated based on formula (2):

[0043] L=n×L1+L2(2)

[0044] Where n is the number of fixed ring tubes 500 between the adsorption carrier 400 and the plastic filter membrane 210, L1 is the axial length (cm) of one fixed ring tube 500, and L2 is the distance (cm) of the plastic filter membrane 210 from the collection tube opening 101 along the axial direction of the collection tube body 100.

[0045] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A passive sampling device, characterized in that, The application relates to a collection tube, which comprises a collection tube body, a filter cover, a sealing cover, an adsorption carrier and a plurality of fixed ring tubes, one end of the collection tube body is provided with a collection tube opening which is communicated with the outside, the filter cover is arranged at the collection tube opening of the collection tube body and is provided with a filter cover opening which is communicated with the collection tube opening, the sealing cover is used for synchronously opening or closing the collection tube opening and the filter cover opening, a plurality of the fixed ring tubes are sequentially arranged in the collection tube body along the axial direction of the collection tube body, and the adsorption carrier is arranged in the collection tube body and is arranged between any two adjacent fixed ring tubes or is arranged on one side of any one of the fixed ring tubes which is away from the collection tube opening.

2. The passive sampling device of claim 1, wherein, The inner wall of the collection tube body is provided with a plurality of guide prisms along the axial direction of the collection tube body, the plurality of guide prisms are sequentially and equidistantly distributed along the circumferential direction of the collection tube body, the edge of the adsorption carrier is provided with a plurality of guide notches, the plurality of guide notches are respectively and one-to-one correspondingly connected with each guide prism along the axial direction of the collection tube body, and the outer wall of the fixed ring tube is provided with a plurality of guide grooves which are respectively and one-to-one correspondingly connected with each guide prism along the axial direction of the collection tube body.

3. The passive sampling device of claim 2, wherein, The adsorption carrier comprises an adsorption area and a fixed area which is arranged around the outer periphery of the adsorption area, the adsorption area is arranged to avoid each fixed ring tube along the axial direction of the collection tube body, the fixed area is arranged relative to each fixed ring tube along the axial direction of the collection tube body, the adsorption area is provided with an adsorption coating, and the fixed area is provided with a plurality of guide notches.

4. The passive sampling device of claim 1, wherein, The inner wall of the filter cover is provided with a first flange which is abutted to one end of the collection tube body which is provided with the collection tube opening, the inner part of the filter cover is further provided with a plastic filter membrane and a metal screen, the plastic filter membrane and the metal screen are sequentially fixed to one side of the first flange which is away from the collection tube opening along the axial direction of the collection tube body, the plastic filter membrane is arranged on the side which is adjacent to the collection tube opening, and the metal screen is arranged on the side which is away from the collection tube opening.

5. The passive sampling device of claim 4, wherein, The inner wall of the filter cover is provided with a second flange, the first flange and the second flange are oppositely spaced along the axial direction of the collection tube body to form an annular groove, and the plastic filter membrane and the metal screen are clamped and fixed in the annular groove.

6. The passive sampling device of claim 5, wherein, One end of the outer wall of the collection tube body which is adjacent to the collection tube opening is provided with a first thread, one end of the inner wall of the filter cover which is adjacent to the collection tube body is provided with a second thread which is matched with the first thread to form a threaded connection, and one end of the outer wall of the filter cover which is adjacent to the collection tube body is further provided with a friction stripe.

7. The passive sampling device of claim 6, wherein, The minimum diameter of the filter cover opening is 20 mm, the metal screen is a stainless steel screen with a pore size of less than 35 mesh, and the plastic filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 5 um.

8. The passive sampling device of claim 1, wherein, The collection tube body, the filter cover, the sealing cover and each fixed ring tube are all polyethylene parts, and the adsorption carrier is a fiber filter paper with an adsorption coating.

9. The passive sampling device according to any one of claims 1 to 8, wherein, The protective cover has a cavity structure inside, the bottom of the cavity structure has an opening communicating with the outside, the top of the cavity structure is provided with an adhesive layer, and the protective screen mesh movable cover is arranged on the opening. The multiple collection tube bodies and the corresponding filter cover bodies are located in the cavity structure, and the ends of the multiple collection tube bodies away from the collection tube ports are respectively adhered and fixed to the adhesive layer.

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