A soil volatile organic compound detection device and detection method

Abstract

The application discloses a soil volatile organic compound detection device and a detection method. The detection device comprises a soil sampler, a volatile channel and an organic compound detector. A drill bit and an agitator are arranged in the soil sampler. After the soil is drilled by the drill bit, the agitator scatters the soil. The bottom of the volatile channel is wrapped around the periphery of the agitator. The volatile channel extracts volatile organic compounds from the scattered soil. The top of the volatile channel is connected with the organic compound detector. The volatile organic compounds are sent into the organic compound detector through the volatile channel. The organic compound components in the soil are detected. The application solves the problems of low detection efficiency and poor accuracy of the existing soil volatile organic compound detection.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology, specifically to a soil volatile organic compound (VOC) detection device and detection method. Background Technology

[0002] Volatile organic compounds (VOCs) refer to various organic compounds with boiling points ranging from 50℃ to 260℃ at room temperature. Common VOCs harmful to human health include volatile halogenated hydrocarbons, benzene compounds, and chlorobenzenes. Once VOCs enter soil and groundwater systems, they affect crop growth, damage vegetation, and seriously endanger human health. The main reason is that the quantity and rate of VOCs entering the soil exceed the soil's carrying capacity and purification rate, causing changes in the soil's properties, composition, and characteristics, allowing the accumulation of pollutants to gradually become dominant. Therefore, detecting VOCs in soil plays a crucial role in pollution prevention and control.

[0003] Currently, VOCs analysis primarily relies on laboratory instruments. However, due to the highly volatile and easily lost nature of VOCs, while laboratory instruments can accurately characterize and quantify them, the multiple intermediate steps involved in sample transportation and storage significantly increase the likelihood of volatilization, resulting in untimely analysis and high costs. Therefore, there is an urgent need to develop a real-time, rapid on-site VOCs analysis device. Summary of the Invention

[0004] Therefore, the present invention provides a soil volatile organic compound (VOC) detection device and detection method to solve the problems of low efficiency and poor accuracy in existing soil VOC detection methods.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The first aspect of this invention provides a soil volatile organic compound (VOC) detection device, comprising:

[0007] Soil sampler, volatile matter channel, and organic matter detector;

[0008] The soil sampler is equipped with a drill bit and a mixer. After the soil is drilled through the drill bit, the mixer disperses the soil.

[0009] The bottom of the evaporation channel is wrapped around the outside of the agitator, and volatile organic compounds are extracted from the broken soil through the evaporation channel;

[0010] The top of the volatile matter channel is connected to the organic matter detector, through which volatile organic compounds are sent into the organic matter detector to detect the organic matter composition in the soil.

[0011] Furthermore, the soil sampler includes a drill bit that can reciprocate within a volatilization channel driven by a motor, thereby drilling underground soil.

[0012] Furthermore, the soil sampler also includes a stirrer, which is fitted inside the bottom of the volatilization channel;

[0013] The agitator includes multiple agitator blades, which are connected to a hollow disc at the bottom of the volatilization channel. The rotation of the hollow disc drives the agitator blades to rotate, breaking up the soil drilled by the drill bit.

[0014] Furthermore, the hollow disc is connected to a heating device, which heats the hollow disc made of metal, and the hollow disc transfers heat to multiple stirring blades;

[0015] The stirring blades heat the soil during the process of breaking it up, which accelerates the volatilization of organic matter in the soil.

[0016] Furthermore, the evaporation channel is a hollow columnar body, with its bottom attached to the ground surface to form an airflow channel, allowing volatile organic compounds in the soil to enter the evaporation channel.

[0017] Furthermore, a fan is installed inside the evaporation channel to accelerate the flow of volatile organic compounds into the evaporation channel.

[0018] Furthermore, an organic matter detector is installed at the top of the evaporation channel, and a power supply is provided at the top of the organic matter detector to supply power to all electrical devices. A protective shell is installed on the outside of the organic matter detector, and the volatile organic compounds in the evaporation channel enter the organic matter detector for volatile organic compound component detection.

[0019] Furthermore, the organic matter detector is also connected to a gas processing device. The volatile organic compounds detected and analyzed by the organic matter detector enter the gas processing device, are processed by the gas processing device, and then the relevant gases are emitted.

[0020] Furthermore, protective supports are installed on both sides of the evaporation channel, which are used to apply pressure to the soil during soil sampling.

[0021] A second aspect of the present invention provides a method for detecting volatile organic compounds in soil, using at least the detection device provided in the first aspect of the present invention, comprising the following steps:

[0022] The organic matter detector receives volatile organic compounds (VOCs) in the evaporation channel;

[0023] The volatile organic compounds are sequentially subjected to low-temperature collection, dehydration, purification and concentration steps to effectively extract and concentrate the volatile organic compounds to be tested;

[0024] The integrated gas chromatography-mass spectrometry system, using selective ion monitoring mode or full scan mode, combined with the set chromatographic column and mass spectrometry conditions, enables qualitative and quantitative analysis of various volatile organic compounds in soil;

[0025] Based on the analysis data generated for each component, the data is presented in the form of data reports.

[0026] The present invention has the following advantages:

[0027] Soil is extracted and agitated using a soil sampler, and the soil is heated by stirring blades, which helps accelerate the volatilization of volatile organic compounds (VOCs). The VOC gases are then transported through a volatilization channel, enabling the organic matter detector to accurately detect VOCs in the soil. This invention effectively extracts and accurately measures VOCs in soil, and the entire detection process is fast, accurate, and highly automated, greatly improving the efficiency and accuracy of VOC detection in soil. Attached Figure Description

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0029] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0030] Figure 1 This is a schematic diagram of a soil volatile organic compound detection device provided in an embodiment of the present invention;

[0031] Figure 2 This is a flowchart of a method for detecting volatile organic compounds in soil, provided as an embodiment of the present invention.

[0032] In the diagram: 1. Evaporation channel; 2. Organic matter detector; 3. Drill bit; 4. Stirring blade; 5. Power supply; 6. Fan; 7. Gas handling equipment; 8. Protective support. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0035] like Figure 1 As shown, this embodiment provides a soil volatile organic compound (VOC) detection device, comprising:

[0036] Soil sampler, volatile matter channel 1, and organic matter detector 2;

[0037] The soil sampler is equipped with a drill bit 3 and a mixer. After the soil is drilled by the drill bit 3, the mixer disperses the soil.

[0038] The bottom of the evaporation channel 1 is wrapped around the outside of the agitator, and volatile organic compounds are extracted from the broken soil through the evaporation channel 1;

[0039] The top of the volatile matter channel 1 is connected to the organic matter detector 2. Volatile organic compounds are sent into the organic matter detector 2 through the volatile matter channel 1 to detect the organic matter composition in the soil.

[0040] In this embodiment, the soil sampler can directly collect volatile organic compounds from the soil on-site without the need for additional collection equipment. Furthermore, the multiple components accelerate the dissipation rate of volatile organic compounds, which helps to quickly extract the relevant gases. The setting of the volatile channel 1 ensures that the volatile organic compounds can quickly and completely enter the organic matter detector 2, and the detection and analysis of the organic matter detector 2 achieves accurate detection of each component.

[0041] The soil sampler includes a drill bit 3, which can reciprocate within the volatilization channel 1 driven by a motor, and drills underground soil through the drill bit 3.

[0042] In this embodiment, the drill bit 3 of the soil sampler is connected to the motor via a transmission rod. The motor can rotate forward or backward. When the motor rotates forward, the transmission rod drives the drill bit 3 to drill downward and collect soil. When the motor rotates backward, the transmission rod drives the drill bit 3 to rise, thus lifting and resetting the drill bit 3. By setting the drill bit 3, it is possible to quickly break through the soil and enter the ground, which is more labor-saving and efficient than the previous method of manually digging or tamping the soil. In this invention, volatile organic compounds can be collected from 20 cm of topsoil.

[0043] The soil sampler also includes a stirrer, which is fitted inside the bottom of the volatilization channel 1;

[0044] The agitator includes multiple agitator blades 4, which are connected to a hollow disc at the bottom of the evaporation channel 1. The rotation of the hollow disc drives the agitator blades 4 to rotate, breaking up the soil drilled by the drill bit 3.

[0045] In this embodiment, multiple stirring blades 4 can be set according to actual application requirements. Each stirring blade 4 is connected to a hollow disc through a metal support rod and surrounds the hollow disc. Through the cooperation of the motor power output shaft and gears, the hollow disc is driven to rotate. The stirring blades 4 driven by the hollow disc break up the drilled soil. Breaking up the soil helps to release the volatile organic compounds in the soil.

[0046] In addition, the hollow disc is connected to a heating device, which heats the hollow disc made of metal, and the hollow disc transfers heat to multiple stirring blades 4;

[0047] The stirring blade 4 heats the soil during the soil-breaking process, which accelerates the volatilization of organic matter in the soil.

[0048] The hollow disc is heated by a heating device, and the heat is transferred to the stirring blade 4. The stirring blade 4 heats the soil simultaneously while breaking it up, promoting the volatilization of volatile organic compounds (VOCs) in the soil. By controlling the temperature, organic components with different volatilization temperatures can be collected separately. Different VOCs have different critical volatilization temperatures. To specifically extract and measure a certain VOC, the temperature of the stirring blade 4 can be set to this critical value. The corresponding VOC volatilizes, while other VOCs do not volatilize because they have not reached the volatilization critical value, thus achieving precise extraction.

[0049] The volatile organic compound 1 is a hollow column with its bottom attached to the ground surface, forming an airflow channel through which volatile organic compounds in the soil enter the volatile organic compound 1.

[0050] In this embodiment, the evaporation channel 1 can be cylindrical with a hollow center. The drill bit 3 can reciprocate within the hollow cylinder of the evaporation channel 1. A gap exists between the drill bit 3 and the inner wall of the evaporation channel 1, allowing the volatile organic compounds (VOCs) to escape. In practical applications, the evaporation channel 1 can be flush with the ground or inserted into the soil. The evaporation channel 1 forms a relatively closed air transport channel, allowing VOCs to enter the evaporation channel 1 during the evaporation process, thus enabling the collection of VOCs.

[0051] In addition, a fan 6 is installed inside the evaporation channel 1 to accelerate the flow of volatile organic compounds into the evaporation channel 1. The speed of the fan 6 can be adjusted according to the required collection rate. Increasing the speed of the fan 6 increases the flow rate of volatile organic compounds, while decreasing the speed of the fan 6 decreases the flow rate of volatile organic compounds, achieving real-time adjustment to meet actual needs.

[0052] An organic matter detector 2 is installed at the top of the evaporation channel 1. A power supply 5 is located at the top of the organic matter detector 2, supplying power to all electrical equipment. A protective shell is installed on the outside of the organic matter detector 2 to protect it. Volatile organic compounds from the evaporation channel 1 enter the organic matter detector 2 for volatile organic compound component detection. Protective supports 8 are installed on both sides of the evaporation channel 1, which are used to apply pressure to the soil during soil sampling.

[0053] In this embodiment, the organic matter detector 2 collects the volatile organic compounds conveyed by the volatile channel 1, and after multiple processing steps, completes the detection of each component in the volatile organic compounds.

[0054] The organic matter detector 2 is also connected to a gas treatment device 7. The volatile organic compounds detected and analyzed by the organic matter detector 2 will enter the gas treatment device 7, and will be treated by the gas treatment device 7 before being emitted. By connecting to the gas treatment device 7 after the relevant volatile organic compounds have been detected, non-toxic and harmless emissions are achieved, making it completely environmentally friendly and causing no damage to the environment.

[0055] This embodiment provides a soil volatile organic compound (VOC) detection device. A soil sampler extracts and disperses the soil, and a stirring blade 4 heats the soil, accelerating the volatilization of VOCs. The VOC gas is then transported through a volatilization channel 1, enabling the organic matter detector 2 to accurately detect VOCs in the soil. This invention effectively extracts and accurately measures VOCs in soil, and the entire detection process is fast, accurate, and highly automated, significantly improving the efficiency and accuracy of VOC detection in soil.

[0056] like Figure 2As shown, this embodiment also discloses a method for detecting volatile organic compounds in soil. The method uses at least the detection device described above and includes the following steps:

[0057] In step S100, the organic matter detector receives volatile organic gas in the evaporation channel;

[0058] In step S200, the volatile organic compound gas is sequentially subjected to low-temperature collection, dehydration, purification and concentration steps to effectively extract and concentrate the volatile organic compounds to be tested.

[0059] Step S300: Integrate a gas chromatograph-mass spectrometer, using selective ion monitoring mode or full scan mode, combined with the set chromatographic column and mass spectrometry conditions, to achieve qualitative and quantitative analysis of various volatile organic compounds in the soil;

[0060] Step S400: Generate corresponding analytical data based on each component, and display the analytical data in the form of a data report.

[0061] Specifically, by sequentially subjecting volatile organic compound (VOC) gases to low-temperature collection, dehydration, purification, and concentration steps, the VOCs to be tested are effectively extracted and concentrated. Then, an integrated gas chromatography-mass spectrometry (GC-MS) instrument is used to measure each component, achieving quantitative and qualitative analysis. This method can measure common VOC components, including but not limited to: carbon tetrachloride, chloroform, aminomethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1-dichloroethylene, and cis-1, 2-Dichloroethylene, trans-1,2-dichloroethylene, dichloromethane, 1,2-diaminopropane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, tetraaminoethylene, 1,1,1-triaminoethane, 1,1,2-trichloroethane, triaminoethylene, 1,2,3-trichloropropane, vinyl chloride, benzene, aminobenzene, 1,2-phenylenediamine, 1,4-phenylenediamine, ethylbenzene, styrene, xylene, m-xylene + p-xylene, o-xylene.

[0062] After the measurements are completed, a list of each component will be displayed, with the specific content of each component marked. Alternatively, the content and proportion of each component can be visually displayed in the form of bar charts or line graphs, which will help to conduct more in-depth analysis later.

[0063] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A soil volatile organic compound (VOC) detection device, characterized in that, The system includes a soil sampler, a volatile matter channel, and an organic matter detector. The soil sampler contains a drill bit and a mixer. After the soil is drilled through the drill bit, the mixer disperses the soil. The bottom of the volatile matter channel surrounds the mixer, and volatile organic compounds are extracted from the dispersed soil through the volatile matter channel. The top of the volatile matter channel is connected to the organic matter detector, and the volatile organic compounds are delivered to the organic matter detector through the volatile matter channel for detection of the organic matter composition in the soil.

2. The soil volatile organic compound detection device according to claim 1, characterized in that, The soil sampler includes a drill bit that can reciprocate within a volatilization channel driven by a motor, and the drill bit is used to extract underground soil.

3. The soil volatile organic compound detection device according to claim 2, characterized in that, The soil sampler also includes a stirrer, which is fitted inside the bottom of the volatilization channel; The agitator includes multiple agitator blades, which are connected to a hollow disc at the bottom of the volatilization channel. The rotation of the hollow disc drives the agitator blades to rotate, breaking up the soil drilled by the drill bit.

4. The soil volatile organic compound detection device according to claim 3, characterized in that, The hollow disc is connected to a heating device, which heats the hollow disc made of metal, and the hollow disc transfers heat to multiple stirring blades. The stirring blades heat the soil during the process of breaking it up, which accelerates the volatilization of organic matter in the soil.

5. The soil volatile organic compound detection device according to claim 1, characterized in that, The volatilization channel is a hollow columnar body, with its bottom attached to the ground surface to form an airflow channel, allowing volatile organic compounds in the soil to enter the volatilization channel.

6. The soil volatile organic compound detection device according to claim 5, characterized in that, A fan is installed inside the evaporation channel to accelerate the flow of volatile organic compounds into the evaporation channel.

7. The soil volatile organic compound detection device according to claim 1, characterized in that, An organic matter detector is installed at the top of the evaporation channel. A power supply is provided at the top of the organic matter detector to supply power to all electrical devices. A protective shell is installed on the outside of the organic matter detector. Volatile organic compounds in the evaporation channel enter the organic matter detector for volatile organic compound component detection.

8. The soil volatile organic compound detection device according to claim 7, characterized in that, The organic matter detector is also connected to a gas processing device. Volatile organic compounds detected and analyzed by the organic matter detector enter the gas processing device, are processed by the gas processing device, and then the relevant gases are emitted.

9. The soil volatile organic compound detection device according to claim 1, characterized in that, Protective supports are installed on both sides of the evaporation channel, which are used to apply pressure to the soil during soil sampling.

10. A method for detecting volatile organic compounds in soil, characterized in that, The method uses at least the detection device as described in any one of claims 1-9, and includes the following steps: The organic matter detector receives volatile organic compounds (VOCs) in the evaporation channel; The volatile organic compounds are sequentially subjected to low-temperature collection, dehydration, purification and concentration steps to effectively extract and concentrate the volatile organic compounds to be tested; The integrated gas chromatography-mass spectrometry system, using selective ion monitoring mode or full scan mode, combined with the set chromatographic column and mass spectrometry conditions, enables qualitative and quantitative analysis of various volatile organic compounds in soil; Based on the analysis data generated for each component, the analysis data is presented in the form of data reports.

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