Method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and underground water

Abstract

The invention belongs to the technical field of environmental pollution detection, and discloses a method and a system for detecting multiphase chlorinated hydrocarbon pollutants in soil and underground water, the method comprises the following protective cover: S1, arranging a multiphase chlorinated hydrocarbon pollutant concentration detection experiment device; s2, constructing a multiphase detection data analysis model; s3, carrying out a multiphase detection experiment; s4, detecting an actual sample; the system comprises a cloud server, a management terminal and at least one set of multiphase chlorinated hydrocarbon pollutant concentration detection experiment device. By improving the multiphase chlorohydrocarbon pollutant concentration detection experimental device and constructing the multiphase detection data analysis model, synchronous detection of the multiphase occurrence concentration of chlorohydrocarbon in soil and groundwater environments can be realized, and the soil chlorohydrocarbon pollution level can be evaluated more comprehensively; the method can be widely applied to identification of potential risks of soil pollution and accurate prevention and control of soil chlorinated hydrocarbon pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental pollution detection, and in particular to a method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater. Background Art

[0002] Chlorinated hydrocarbons are an important class of organic synthesis intermediates and are the starting materials for many organic syntheses. Among them, organic chlorinated hydrocarbons are widely used as solvents, industrial and civilian cleaning agents, but these substances can not only damage the skin and cause central nervous system poisoning, but also cause damage to cell protoplasm, heart, etc., and have adverse effects on the liver, kidneys, and pancreas. Some compounds may also have carcinogenic effects. Therefore, all organic chlorides are highly toxic. In addition to a very small part of chlorinated hydrocarbons in the atmosphere coming from natural biological metabolism, they mainly come from human pollution. The chlorine atoms released by chlorinated hydrocarbons will act as a catalyst for the decomposition of ozone and destroy the atmospheric ozone layer. Carrying out the determination of volatile chlorinated hydrocarbons in ambient air will provide basic data for the investigation and control of volatile chlorinated hydrocarbon pollution, which is of great significance for protecting the environment and protecting people's health. However, there are many types of volatile chlorinated hydrocarbons. Volatile chlorinated hydrocarbons usually refer to halogenated compounds with a boiling point below 200°C. Almost all chlorinated hydrocarbons with less than 8 carbon atoms and less than 5 halogen atoms are volatile halogenated hydrocarbons. The objects of analysis vary according to management needs and analytical technical capabilities.

[0003] At present, the detection technology of chlorinated hydrocarbons in soil mainly uses chromatography-mass spectrometry instruments, which mainly focus on the detection of single phases such as residual phase and gas phase. The current detection technology can accurately detect the concentration level of a certain chlorinated hydrocarbon in a phase in the soil, but these technologies ignore the differences in the physical and chemical properties of chlorinated hydrocarbon pollutants and soil, resulting in the existence of multiple phases of chlorinated hydrocarbons in different types of soil, and the concentration of each phase is different. It is difficult for the current detection technology to simultaneously detect the concentration of each phase under multiple phases.

[0004] The existence phases of chlorinated hydrocarbons in different types of soil and groundwater mainly include the following: Gas phase: Due to their volatility, chlorinated hydrocarbons may exist in the form of gas phase in the soil, especially in the soil pores or above the soil surface. Gas phase chlorinated hydrocarbons can enter the atmosphere from the soil through volatilization, or form a dynamic equilibrium between the atmosphere and the soil; Free phase: refers to the phase in which chlorinated hydrocarbons exist independently without being restricted or mixed with other phases; Water phase (dissolved phase): Chlorinated hydrocarbons can be dissolved in the water phase in the soil pore water. The migration and transformation of dissolved chlorinated hydrocarbons in the soil are affected by many factors such as water flow and soil properties; Solid phase (residual phase): Chlorinated hydrocarbons can also be adsorbed on the surface of the soil solid phase, including soil particles, soil organic matter, etc. Adsorption is one of the important forms of existence of chlorinated hydrocarbons in the soil, which affects the migration and transformation behavior and environmental risks of chlorinated hydrocarbons in the soil.

[0005] In the actual soil environment, different types of chlorinated hydrocarbons exist in various phases in different soils, and the concentration distribution of various phases also varies greatly. Specifically for different types of soil, the storage phase of chlorinated hydrocarbons will also be different. For example, in sandy soil, due to the large soil particles and high porosity, chlorinated hydrocarbons may be more likely to exist in the form of gas and water phases; while in clay soil, due to the small soil particles and low porosity, chlorinated hydrocarbons may be more easily adsorbed on the surface of the soil solid phase. In addition, factors such as the organic matter content, soil pH, and soil moisture in the soil will also affect the storage phase of chlorinated hydrocarbons. For example, soils with a high organic matter content have a stronger adsorption capacity for chlorinated hydrocarbons, which may promote the transformation of chlorinated hydrocarbons to the solid phase; and changes in soil pH may affect the solubility and adsorption capacity of chlorinated hydrocarbons in the soil, thereby affecting their storage phase.

[0006] Existing detection technology can only detect a single phase of chlorinated hydrocarbons in soil and groundwater, while ignoring the existence of other phases. This is not conducive to the identification of potential risks of soil pollution and the precise prevention and control of soil chlorinated hydrocarbon pollution, and is not conducive to the precise elimination of its potential threats to environmental safety and human health. Summary of the invention

[0007] The purpose of the present invention is to address the above-mentioned deficiencies and provide a method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater. In view of the fact that the storage phases of chlorinated hydrocarbons in different types of soils mainly include gas phase, water phase, solid phase, free phase and other forms, by improving the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device and constructing a multiphase detection data analysis model, it is possible to achieve simultaneous detection of the multiphase storage concentration of chlorinated hydrocarbons in soil and groundwater environments, and to more comprehensively evaluate the pollution level of chlorinated hydrocarbons in soil. It can be widely used in the identification of potential risks of soil pollution and the precise prevention and control of soil chlorinated hydrocarbon pollution, so as to solve the problems of the above-mentioned prior art.

[0008] The present invention provides the following technical solutions: A method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater, characterized in that it comprises the following steps: S1. Set up a multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device Set up at least one set of experimental equipment for detecting the concentration of multiphase chlorinated hydrocarbon pollutants in soil and groundwater, which includes: a host computer, a soil column experimental platform, and detection instruments such as gas chromatography-mass spectrometry and a capillary column; S2. Constructing a multi-phase detection data analysis model The multiphase chlorinated hydrocarbon pollutant detection data analysis model is constructed as follows: C = C Free phase + C Dissolved phase + C Residual phase + C Gas phase 1 Where: C, concentration of chlorinated hydrocarbon mixture, mg / L; C Free phase , concentration of chlorinated hydrocarbons in the free phase, mg / L; C Dissolved phase , concentration of chlorinated hydrocarbons in the dissolved phase, mg / L; C Residual phase , concentration of chlorinated hydrocarbons in the residual phase, mg / L; C Gas phase , concentration of gaseous chlorinated hydrocarbons, mg / L; S3. Conduct multi-phase detection experiments Through the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device, multiphase detection experiments were carried out under homogeneous and heterogeneous soil column conditions. Multiple glass columns in the soil column experimental platform were used to carry out different chlorinated hydrocarbons. The migration experiment in different soil columns was carried out, and multiple sets of interrelated multiphase occurrence experimental data were obtained. S4. Conduct testing of actual samples The multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device and the multi-phase detection data analysis model are applied to the detection of actual samples, and the concentration data of other phases are calculated through the detection data of some phases to obtain complete multi-phase chlorinated hydrocarbon pollutant detection data; S5. Construct a multi-phase chlorinated hydrocarbon pollutant detection system for simultaneous sample detection A multiphase chlorinated hydrocarbon pollutant detection system is constructed, which consists of a cloud server, a management terminal and a multiphase chlorinated hydrocarbon pollutant concentration detection experimental device. Multiple samples are detected and analyzed simultaneously, and the detection results of each detected sample are output.

[0009] A detection system for multiphase chlorinated hydrocarbon pollutants in soil and groundwater, which is used to implement the above-mentioned detection method, characterized in that: The detection system includes: a cloud server, a management terminal and at least one set of multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device, and the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device includes a host computer, a soil column experimental platform, and detection instruments such as a gas chromatograph and a capillary column; The management terminal and the host computer are connected to the cloud server via the Internet respectively; the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device is connected to the host computer; The cloud server is used to analyze and process the detection data uploaded by the host computer, and output complete detection results of multi-phase chlorinated hydrocarbon pollutant concentrations; The multiphase chlorinated hydrocarbon pollutant concentration detection experimental device is used to detect samples under experimental conditions and actual sampling; The host computer is used to control the work of the phase chlorinated hydrocarbon pollutant concentration detection experimental device, receive the detection data obtained by the phase chlorinated hydrocarbon pollutant concentration detection experimental device, and perform data preprocessing; Management terminal, used to input data and instructions to the cloud server or display the test results output by the cloud server; The soil column experimental platform comprises: a plurality of detachable glass columns, a plurality of liquid containers, and a plurality of Suma jars. Soil is filled in each glass column to form a soil column group, and then each glass column and liquid container in the soil column group are connected by pipelines; a peristaltic pump and a flow divider are arranged on the pipeline in front of the water inlet end of each glass column; The glass column comprises: a cylindrical hollow glass column with openings on both the upper and lower end surfaces, an upper glass cover, a lower bottom support, and a liquid outlet pipe, wherein the upper glass cover is arranged on the upper end surface of the glass column and is provided with an air lift hole and a liquid inlet hole penetrating the thickness of the glass cover; the lower bottom support is arranged at the lower part of the lower end surface of the glass column, and the liquid outlet pipe penetrates the thickness of the lower bottom support and communicates with the inner cavity of the glass column; The liquid inlet hole of each glass column is connected with the pipeline on the liquid inlet side through a liquid inlet pipe, and a flow control valve is arranged on the liquid inlet pipe.

[0010] The advantages and beneficial effects of the present invention include at least the following: 1. The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided by the present invention mainly include gas phase, water phase, solid phase, free phase and other phases in different types of soil, and consider the objective reality that the specific phase distribution of chlorinated hydrocarbon pollutants is affected by various factors such as soil type and soil properties. By improving the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device and constructing a multiphase detection data analysis model, it is possible to achieve simultaneous detection of the multiphase occurrence concentration of chlorinated hydrocarbons in soil and groundwater environments, and can more comprehensively evaluate the pollution level of chlorinated hydrocarbons in soil. It can be widely used in the identification of potential risks of soil pollution and the precise prevention and control of chlorinated hydrocarbon pollution in soil, so as to solve the problems of the above-mentioned prior art and make up for the shortcomings of the current chlorinated hydrocarbon soil detection technology.

[0011] 2. The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided by the present invention select three typical chlorinated hydrocarbons (carbon tetrachloride, chlorobenzene, and 1,2,4-trichlorobenzene) from a large number of chlorinated hydrocarbons according to the detectability, toxicity, and environmental persistence of high-risk organic toxic substances as target detection objects, and construct a multiphase detection data analysis model based on the phase distribution and occurrence change laws of these three chlorinated hydrocarbons in different soil media. In the process of detecting actual samples, the occurrence concentrations of other phases can be calculated based on the data of the detected partial phases (such as the residual phase), thereby greatly simplifying the detection process and detection difficulty, and being able to meet the needs of large-scale sample detection with different components and under different conditions.

[0012] 3. The present invention provides a method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater. A new soil column experimental model including homogeneous soil and heterogeneous soil is designed, and the rapid and accurate filling of soil samples is achieved by optimizing the column design. During the design process, the soil column model is tested and analyzed using three typical chlorinated hydrocarbons, and the obtained test results are in good agreement with the results of the separate tests. At the same time, through data analysis, the law or correlation of the phase distribution concentration changes of the three chlorinated hydrocarbons in different soil media is discovered, and this law can be applied to the detection of new soil samples and simplify the detection method. The law of phase distribution concentration change is mainly affected by factors such as the basic characteristics of chlorinated hydrocarbons and soil. For example, the more organic matter content the soil has and the smaller the porosity, the stronger the adsorption capacity for chlorinated hydrocarbon pollutants will be, and the proportion of residual chlorinated hydrocarbons will be relatively higher. If the saturated vapor pressure of chlorinated hydrocarbons is large and they are easy to volatilize, they will mainly exist in the form of gas phase in the soil. Among them, 1,2,4-trichlorobenzene is highly hydrophobic, and combined with the characteristics of clay such as high organic matter content and small porosity, 1,2,4-trichlorobenzene is basically adsorbed in the clay and mainly exists in the form of residual phase.

[0013] 4. The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided by the present invention can realize accurate and convenient multiphase synchronous detection through a newly designed multiphase chlorinated hydrocarbon pollutant concentration detection experimental device and a multiphase detection data analysis model, greatly simplifying the detection steps; by layering and sampling different types of soil media, soil column experimental data can be obtained more efficiently in actual application, and the characteristic level of chlorinated hydrocarbon pollution in the soil environment can be evaluated more quickly.

[0014] 5. The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided by the present invention can obtain multiphase detection data of chlorinated hydrocarbons in soil, which can distinguish the main existing phases of different chlorinated hydrocarbons in soil, and provide data basis for the multiphase precise remediation of chlorinated hydrocarbon-contaminated soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the network composition structure of the detection system according to an embodiment of the present invention; Figure 2 Schematic diagram of the composition structure of the soil column experimental platform in an embodiment of the present invention; Figure 3 is a schematic structural diagram of a glass column according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the detection and analysis results of multiphase pollutants in an embodiment of the present invention.

[0016] In the figure: 1. Soil column experimental platform; 2. Glass column; 3. Pipeline; 4. CHCs mixed liquid container; 5. Peristaltic pump; 6. Hard pipe group; 7. Flow control valve; 8. Waste liquid container; 9. Dissolved phase CHCs container; 10. Suma tank; 21. Hollow glass column; 22. Upper glass cover; 23. Lower base; 24. Liquid inlet hole; 25. Air lift hole; 26. Liquid outlet hole; 27. Fixed rubber ring. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1 See attached Figures 1 to 4 The present embodiment provides a method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater, which comprises the following steps: S1. Set up a multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device Set up an experimental device for detecting the concentration of multiphase chlorinated hydrocarbon pollutants in soil and groundwater, which includes: a host computer, a soil column experimental platform, and detection instruments such as gas chromatography-mass spectrometry and capillary columns; specifically includes: S1-1. Setting up soil column experimental platform Each soil column experimental platform 1 includes: a plurality of detachable glass columns 2, a plurality of liquid containers (CHCs mixed liquid container 4, waste liquid container 8, dissolved phase CHCs container 9), and a plurality of Suma tanks 10. Soil is filled in each glass column 2 to form a soil column group, and then each glass column 2 and liquid container in the soil column group are connected by a pipeline 3; a peristaltic pump 5 and a flow divider (not shown in the figure) are arranged on the pipeline 4 at the front section of the water inlet end of each glass column 2, and a section of the pipeline 4 is a hard pipe group 6, in which the flow divider is built-in, and the CHCs mixed liquid is diverted to each glass column 2; The glass column 2 comprises: a cylindrical hollow glass column 21 with openings on both the upper and lower end faces, an upper glass cover 22 and a lower base 23, a liquid inlet pipe and a liquid outlet pipe, wherein the upper glass cover 22 is arranged on the upper end face of the glass column 21 and seals the opening at the end face, and is provided with an air lift hole 25 and a liquid inlet hole 24 penetrating the thickness of the upper glass cover 22; the liquid inlet pipe passes through the liquid inlet hole 24 to connect the diverter and the inner cavity of the glass column 21; the lower base 23 is arranged at the lower part of the lower end face of the glass column 21, and the liquid outlet pipe passes through the thickness of the lower base and then passes through the liquid outlet hole 26 to connect with the inner cavity of the glass column 21; the liquid inlet hole 24 of each glass column 2 is connected to the pipeline 4 on the liquid inlet side through the liquid inlet pipe, and a flow control valve 7 is also provided on the liquid inlet pipe; the various parts of the glass column 2 are detachably connected; a fixing rubber ring 27 is arranged around the glass column 21 to assist in fixing the glass column 21; S1-2. Set up testing equipment Set up a host computer, a gas chromatography-mass spectrometer (GC-MS) and a capillary column as detection instruments, connect the GC-MS and the capillary column to the host computer, and connect the GC-MS and the capillary column to each soil column experimental platform; S1-3. From a large number of chlorinated hydrocarbons, three typical chlorinated hydrocarbons, carbon tetrachloride, chlorobenzene, and 1,2,4-trichlorobenzene, were selected as the experimental target detection objects for the soil column experimental platform according to the detectability, toxicity, and environmental persistence of high-risk organic toxic substances; S2. Constructing a multi-phase detection data analysis model Specifically include: S2-1. Definition of multiphase concentration of chlorinated hydrocarbons Concentration of free phase chlorinated hydrocarbons: It is the concentration of chlorinated hydrocarbons that exist independently without being restricted or mixed with other phases, and is calculated using the law of conservation of concentration; Concentration of dissolved chlorinated hydrocarbons: It is the concentration of chlorinated hydrocarbons dissolved in soil pore water, obtained by CHCs soil column migration experiment and detection; The concentration of residual chlorinated hydrocarbons is the concentration of chlorinated hydrocarbons adsorbed on the surface of the soil solid phase, which is obtained by CHCs soil column migration experiment and detection; Concentration of gaseous chlorinated hydrocarbons: It is the concentration of chlorinated hydrocarbons in the soil in the form of gas, obtained by CHCs soil column migration experiment and detection; S2-2. Determine the relationship model between multiphase states in CHCs soil column migration experiment By analyzing the rules in the CHCs soil column migration experiment, the relationship model between the multiphase chlorinated hydrocarbon pollutant detection data was determined as follows: C = C Free phase + C Dissolved phase + C Residual phase + C Gas phase Formula 1 Where: C, concentration of chlorinated hydrocarbon mixture, mg / L; C Free phase , concentration of chlorinated hydrocarbons in the free phase, mg / L; C Dissolved phase , concentration of chlorinated hydrocarbons in the dissolved phase, mg / L; C Residual phase , concentration of chlorinated hydrocarbons in the residual phase, mg / L; C Gas phase , concentration of gaseous chlorinated hydrocarbons, mg / L; S2-3. Verify the applicability of the test device and model Comsol was used to simulate the migration behavior of dissolved CHCs in soil, and the physical field control equation was used to verify the experimental device for detecting the concentration of multiphase chlorinated hydrocarbon pollutants and formula 1.

[0019] S3. Conduct multi-phase detection experiments Through the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device, multiphase detection experiments were carried out under homogeneous and heterogeneous soil column conditions, and multiple glass columns in the soil column experimental platform were used to carry out different chlorinated hydrocarbons. The migration experiment in different soil columns was carried out, and multiple sets of interrelated multiphase occurrence experimental data were obtained; specifically including: S3-1. Filling of soil columns After each glass column is filled with soil, a soil column is formed. The filling of the soil column is done by dry filling. After filling multiple soil columns, a soil column group is formed. The soil columns are filled with soils of different properties to obtain homogeneous and inhomogeneous soil column models. After subsequent testing steps, the detection data of multiphase chlorinated hydrocarbon pollutants in complex soil and groundwater environments are obtained. S3-2. Pretreatment of soil columns Before the soil column transport experiment began, CaCl 2 The solution is used to fully saturate the filled experimental column with water flow from bottom to top until the soil column is submerged, the air in the column is expelled and a stable saturated flow field is formed; S3-3. Collection of dissolved chlorinated hydrocarbons The mixture of carbon tetrachloride, chlorobenzene and 1,2,4-trichlorobenzene used in the experiment is passed into the soil column. The filtrate is collected from the bottom of the column in a certain time sequence and collected into a brown glass sample bottle without leaving any gaps and is immediately sealed and stored at low temperature. S3-4. Collection of gaseous chlorinated hydrocarbons During the introduction of CHCs, a cleaned Suma tank equipped with a sampler was used to collect samples at regular intervals, and air was pumped from the top of the soil column at a certain flow rate. After the completion of the extraction, nitrogen was introduced until the tank was filled with gas for dilution; S3-5. Collection of residual chlorinated hydrocarbons After the leaching of pollutants is completed, the soil column should be dismantled and the original state should be maintained as much as possible when taking out the soil samples. The cylindrical soil sample should be cut into soil samples of different depths with a utility knife. After the pre-extraction treatment of each part of the soil sample, it should be tested on the machine.

[0020] S3-6, On-machine testing The collected samples were tested for the concentration of each pollutant using a gas chromatography-mass spectrometer, a capillary column and a host computer, and multiple sets of correlated multiphase chlorinated hydrocarbon pollutant concentration experimental data were obtained. S3-7. Repeat steps S3-1 to S3-6. Through the experimental device, multiphase detection experiments are carried out under homogeneous and heterogeneous soil column conditions respectively. Multiple glass columns in the soil column experimental platform are used to carry out migration experiments of different chlorinated hydrocarbons in different soil columns, and multiple groups of interrelated multiphase occurrence experimental data are obtained; the experimental data are analyzed to obtain the main influencing parameters, factors and change trends of multiphase chlorinated hydrocarbon pollutants in soil and groundwater.

[0021] S4. Conduct testing of actual samples The multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device and the multi-phase detection data analysis model are applied to the detection of actual samples, and the concentration data of other phases are calculated through the detection data of some phases to obtain complete multi-phase chlorinated hydrocarbon pollutant detection data; specifically including: S4-1, filling the actual sample to be tested into each organic glass column in the soil column experimental platform, repeating step S3, and using the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device to detect the concentration of some phases of chlorinated hydrocarbon pollutants in the actual sample; S4-2. Substitute the concentration data of some phases of chlorinated hydrocarbon pollutants detected into the multiphase detection data analysis model formula 1, and obtain the concentration data of other phases through calculation to obtain complete multiphase chlorinated hydrocarbon pollutant detection data. The occurrence concentration of multiphase chlorinated hydrocarbon pollutants in soil and groundwater can be obtained in one test.

[0022] S5. Construct a multi-phase chlorinated hydrocarbon pollutant detection system for simultaneous sample detection Construct a multiphase chlorinated hydrocarbon pollutant detection system consisting of a cloud server, a management terminal and a multiphase chlorinated hydrocarbon pollutant concentration detection experimental device to simultaneously detect and analyze multiple samples and output the test results of each test sample, including: S5-1. Construction of a multi-phase chlorinated hydrocarbon pollutant detection system Construct a multiphase chlorinated hydrocarbon pollutant detection system consisting of a cloud server, a management terminal and at least one set of multiphase chlorinated hydrocarbon pollutant concentration detection experimental device. S5-2. Conduct multi-link synchronous sample testing In a set of multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device, multiple samples filled into various plexiglass columns are detected and analyzed simultaneously, and the detection results of each detected sample are output.

[0023] A detection system for multiphase chlorinated hydrocarbon pollutants in soil and groundwater, which is used to implement the above-mentioned detection method, comprises: a cloud server, a management terminal and at least one set of multiphase chlorinated hydrocarbon pollutant concentration detection experimental device, wherein the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device comprises a host computer, a soil column experimental platform and a detection instrument gas spectrometer and a capillary column; The management terminal and the host computer are connected to the cloud server via the Internet respectively; the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device is connected to the host computer; The cloud server is used to analyze and process the detection data uploaded by the host computer, and output complete detection results of multi-phase chlorinated hydrocarbon pollutant concentrations; The multiphase chlorinated hydrocarbon pollutant concentration detection experimental device is used to detect samples under experimental conditions and actual sampling; The host computer is used to control the work of the phase chlorinated hydrocarbon pollutant concentration detection experimental device, receive the detection data obtained by the phase chlorinated hydrocarbon pollutant concentration detection experimental device, and perform data preprocessing; Management terminal, used to input data and instructions to the cloud server or display the test results output by the cloud server; The soil column experimental platform comprises: a plurality of detachable glass columns, a plurality of liquid containers, and a plurality of Suma jars. Soil is filled in each glass column to form a soil column group, and then each glass column and liquid container in the soil column group are connected by pipelines; a peristaltic pump and a flow divider are arranged on the pipeline in front of the water inlet end of each glass column; The glass column comprises: a cylindrical hollow glass column with openings on both the upper and lower end surfaces, an upper glass cover, a lower bottom support, and a liquid outlet pipe, wherein the upper glass cover is arranged on the upper end surface of the glass column and is provided with an air lift hole and a liquid inlet hole penetrating the thickness of the glass cover; the lower bottom support is arranged at the lower part of the lower end surface of the glass column, and the liquid outlet pipe penetrates the thickness of the lower bottom support and communicates with the inner cavity of the glass column; The liquid inlet hole of each glass column is connected with the pipeline on the liquid inlet side through a liquid inlet pipe, and a flow control valve is also arranged on the liquid inlet pipe.

[0024] The embodiment of the present invention focuses on improving the experimental device for detecting the concentration of multiphase chlorinated hydrocarbon pollutants and constructing a multiphase detection data analysis model, so as to achieve the simultaneous detection of the multiphase occurrence concentration of chlorinated hydrocarbons in soil and groundwater environments, and to conduct a more comprehensive evaluation of the pollution level of chlorinated hydrocarbons in soil. It can be widely used in the identification of potential risks of soil pollution and the precise prevention and control of soil chlorinated hydrocarbon pollution.

[0025] Example 2 The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided in this embodiment are specific implementations based on the first embodiment, and are basically the same as the first embodiment, except that: See also Figure 2 The soil column experimental platform designed in this embodiment includes pipelines, a single-channel peristaltic pump, a diverter, a corrosion-resistant hard pipe group, multiple experimental glass columns (soil column groups), and multiple containers for holding pollutants and effluent.

[0026] See also Figure 3 The experimental organic glass column 2 designed in this embodiment has the following specifications: inner diameter of 5 cm, total length of 30 cm, and solid filling length of 20 cm; a two-hole tin foil wrapped rubber plug is designed in the top of the column, and the inner wall of the experimental column is fully polished with rough paper to reduce the purpose of dominant flow; the soil column experimental device includes multiple glass columns 21, which can be split vertically, and the interface is designed to be nested, which is convenient for loading and unloading soil samples before and after the experiment; after the chlorinated hydrocarbons are adsorbed by the soil in the heterogeneous soil column, in order to more accurately obtain the residual phase distribution characteristics of the three chlorinated hydrocarbons in each soil medium, the glass column 2 is designed to be easy to splice and disassemble.

[0027] The soil column test step includes the following specific steps: 1. Construction of soil column experimental platform The embodiment of the present invention uses a plexiglass column 2 to carry out a migration experiment of chlorinated hydrocarbons in different soil columns. The specifications of the experimental column are: an inner diameter of 5 cm, a total length of 30 cm, and a filling solid length of 20 cm. A two-hole tin foil wrapped rubber plug is designed in the top of the column, and the inner wall of the experimental column is fully polished with rough paper to reduce the purpose of dominant flow. The entire experimental system device includes a pipeline, a single-channel peristaltic pump, a diverter, a corrosion-resistant hard pipe group, a soil column group, a pollutant container and an effluent container.

[0028] The soil column was filled by dry filling. First, a mesh with a pore size of 0.1 mm was placed at the bottom of the column, and 5 cm of treated quartz sand was filled in. Then, the soil samples were packed in layers according to different soil column filling methods. After each layer was filled, it was compacted with tools, and a glass rod was used to roughen the layers. After the soil column was filled, 5 cm of quartz sand was filled in again. Before the column experiment, 0.01 mol / L CaCl 2 The solution fully saturates the filled test column with water flow from bottom to top until the soil column is submerged, the air in the column is expelled and a stable saturated flow field is formed.

[0029] 2. Sample collection and storage 1. Collection of dissolved chlorinated hydrocarbons A 10 mg / L mixture of carbon tetrachloride, chlorobenzene, and 1,2,4-trichlorobenzene was passed into the soil column at a rate of 1.5 mL / min. The filtrate was taken from the bottom of glass column 2 in a certain time sequence and collected into a 1 mL brown glass sample bottle without leaving any gaps. After taking, it was immediately sealed and stored at low temperature.

[0030] 2. Collection of gaseous chlorinated hydrocarbons During the introduction of CHCs, the gas was pumped from the top of the column at a certain flow rate (24 h) for 5 min using a Suma tank 10 at regular intervals (0 h, 2 h, 6 h, 12 h, 24 h, 48 h, 72 h…), and nitrogen was introduced until the tank was filled with gas for dilution.

[0031] The sampling process of the Suma tank is as follows: heat the 3.2 L Suma tank to 70 °C, first use the tank cleaning device (Entech3100A) to evacuate, then fill it with high-purity nitrogen, repeat the cleaning 5 times, and evacuate to vacuum after the last cleaning. Install the cleaned Suma tank with a sampler and set the sampling flow rate to 2.1 ml / min. Collect the gas in the column for 5 minutes, then connect it to a high-precision dilution instrument to fill it with nitrogen, and close the Suma tank valve after the dilution is completed; the sample is stored at room temperature and protected from light, and the analysis is completed within 20 days.

[0032] 3. Collection of residual chlorinated hydrocarbons After the leaching of pollutants is completed, the soil column is dismantled and the original state is maintained as much as possible when taking out the soil samples. The cylindrical soil samples are cut into soil samples of different depths of 0 cm (near the top of the column), 4 cm, 8 cm, 12 cm, 16 cm, and 20 cm with a utility knife. 1 g of soil sample is taken from each sample and tested on the machine after pre-treatment (extraction).

[0033] (III) Sample analysis The pollutant concentrations of the collected samples were detected using an Agilent 7890A-3172A gas chromatograph-mass spectrometer and a DB-624 capillary column (60 m×0.32 mm×1.8μm).

[0034] 1. Sample testing conditions for dissolved phase and residual phase chlorinated hydrocarbons (1) Chromatographic working conditions: programmed temperature: 35 °C (4 min) → 5 °C / min → 120 °C → 10 °C / min → 220 °C (2 min); carrier gas: helium, flow rate 1.0 mL / min; injection mode: split injection (split ratio 10:1), front inlet temperature: 220 °C.

[0035] (2) Mass spectrometry operating conditions: ion source, EI source; ion source temperature, 230 °C; quadrupole temperature, 150 °C; ionization energy, 70 eV; scanning mode, selected ion scanning (SIM); solvent delay of 4 min.

[0036] 2. Working conditions for gas phase chlorinated hydrocarbon detection (1) Pre-concentration conditions Primary cold trap. Capture temperature: -150 ℃; Capture flow rate: 100 mL / min; Desorption temperature: 10 ℃; Valve temperature 100 ℃; Bakeout temperature: 120 ℃; Bakeout time: 20 min Secondary cold trap. Trapping temperature: -15 ℃; Trapping flow rate: 10 mL / min; Trapping time: 5 min; Desorption temperature: 180 ℃; Baking temperature: 220 ℃; Baking time: 20 min.

[0037] Three-level focusing. Focusing temperature: -165 ℃; resolution temperature: 80 ℃; resolution time: 2.5 min, baking temperature: 220 ℃; baking time: 20 min.

[0038] (2) Chromatographic conditions Column 1 (30 m×320 μm×20 μm, Agilent, HP Plot Q) Column 2 (60 m×250 μm×1 μm, Agilent, DB−1) The temperature program of the chromatographic column was as follows: 35 °C for 10 min; increased to 180 °C at 10 °C / min and maintained for 8 min; increased to 220 °C at 15 °C / min and maintained for 15 min.

[0039] Detector: FID; Temperature: 250 °C; Air flow: 400 mL / min; Hydrogen flow: 35 mL / min; Heart cutting time: 11.2 min (3) Mass spectrometry conditions Ion source temperature: 230 °C; MS quadrupole temperature: 150 °C. Scanning mode: full scan (SCAN); Scanning range: 35-300 m / z.

[0040] (IV) Data processing The measured gas phase and dissolved phase chlorinated hydrocarbons are plotted as concentration-time curves, while the residual phase chlorinated hydrocarbons are plotted as concentration-depth curves. Finally, the migration patterns of the three phases of chlorinated hydrocarbons in the soil column can be observed.

[0041] The phase distribution characteristics of chlorinated hydrocarbons in six different soil columns are calculated using the equilibrium concentrations of the dissolved phase, gas phase, and residual phase. The free phase chlorinated hydrocarbon concentration is calculated using the quantitative method of free phase conservation. According to the law of conservation of concentration, the original concentration of a component should be equal to the sum of the concentrations of its various forms in the solution. The CHCs soil column migration experiment can tell the migration concentrations of the dissolved phase, residual phase, and gas phase. The CHCs concentration formula for the free phase is as follows: C = C Free phase + C Dissolved phase + C Residual phase + C Gas phase 1 Where: C, concentration of chlorinated hydrocarbon mixture, mg / L; C Free phase , concentration of chlorinated hydrocarbons in the free phase, mg / L; C Dissolved phase , concentration of chlorinated hydrocarbons in the dissolved phase, mg / L; C Residual phase , concentration of chlorinated hydrocarbons in the residual phase, mg / L; C Gas phase , concentration of gaseous chlorinated hydrocarbons, mg / L.

[0042] 5. Verification of the applicability of the device and model Finally, more chlorinated hydrocarbon components were selected to verify the applicability of this device and model through experiments. The experimental process refers to the above steps (ii), (iii), and (iv). The analysis results show that most of the CHCs in the six soil columns exist in the form of free phase (accounting for about 50%). In addition to the free phase, carbon tetrachloride is mainly in the gas phase (accounting for about 28%), 1,2,4-trichlorobenzene is mainly in the residual phase (accounting for about 35%), and chlorobenzene is mainly in the dissolved phase (accounting for about 25%). The detection trends of other chlorinated hydrocarbon components are basically consistent with these three. For specific results, see Figure 4 .

[0043] The experimental parameters are as follows: 1. Soil column test parameters (1) Initial concentration: CT concentration is 5 mg / L; CB concentration is 8 mg / L; TCB concentration is 8 mg / L Table 1: Basic parameters of three chlorinated hydrocarbons

[0044] a Relative density refers to the density relative to water b China's drinking water hygiene standard (GB5749-2006) Table 2: Blocking factors

[0045] Table 3: Basic parameters of soil columns

[0046] Table 4: Simulation migration parameters

[0047]

[0048] Table 5: Phase distribution concentration ratio table

[0049] The embodiment of the present invention obtains a large amount of experimental data through the experimental device, and obtains the analytical model formula 1. In the detection process of actual samples, according to the concentration data of some phases (such as residual phase, dissolved phase) measured, after substituting into formula 1, the detection data of other phases can be obtained, thereby greatly simplifying the detection process and obtaining a set of correlation detection data with high accuracy and reliability.

[0050] Example 3 The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided in this embodiment are specific implementations based on Embodiments 1 and 2, and are substantially the same as Embodiments 1-2, except that: See also Figure 1 The method and system for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater include multiple sets of multiphase chlorinated hydrocarbon pollutant concentration detection experimental devices 1~N to meet the needs of large-scale sample experiments or detection.

[0051] Step S5 of the detection method also includes: constructing an AI model, obtaining a pre-trained AI model through deep learning, adding more components, parameters, and correlations between factors, and then applying it to the detection and analysis of the actual sample in step S4.

[0052] The cloud server of the soil and groundwater multiphase chlorinated hydrocarbon pollutant detection system also has a built-in multiphase data analysis module, a multiphase data AI processing module (with a built-in AI model), and a multiphase detection result output module; There are multiple sets of the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental devices, each set of the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental devices is connected to a host computer, and the host computer has a built-in multi-phase data acquisition module; The host computer collects the detection data of the detection samples filled in each glass column in each set of multiphase chlorinated hydrocarbon pollutant concentration detection experimental device, and sends it to the multiphase data analysis module of the cloud server; the multiphase data analysis module sends the data to the multiphase data AI processing module after processing, and the data processed by the multiphase data AI processing module is finally output through the multiphase detection result output module.

[0053] Through the soil column experimental platform test device and actual detection data and trend analysis results, the total amount of different pollutants, the content of pollutants in each phase, and the change data between soil media can be obtained, and an AI model (such as DNN) can be constructed. After processing each group of data, the AI ​​model is pre-trained to obtain a multi-phase pollutant content detection AI model after pre-training. The AI ​​model automatically adjusts the relevant parameters according to the changes in the input, and can further include the generalization, verification and optimization of the model. By learning the change rules of parameters that have a greater impact on the migration of chlorinated hydrocarbons in the soil column, when applied to the actual environment, it can more comprehensively and accurately judge the factors that have a greater impact on the migration process and phase distribution characteristics. Then the soil column experimental platform and the AI ​​model are combined and applied to the rapid detection of actual samples, which can greatly simplify the difficulty and process of detecting actual samples and reduce the test instruments and consumables required for detection.

[0054] In this embodiment, the characteristics of the occurrence of multiphase chlorinated hydrocarbon pollutants in soil and groundwater can be analyzed in advance based on available external data, experimental data, etc., and a suitable AI algorithm set can be first constructed with the deep learning algorithm as the basic framework; the system selects the deep learning algorithm as the basic framework, and trains the selected deep learning framework model, performs model performance evaluation during training, and selects the optimal model basic framework and AI algorithm set.

[0055] The optional AI algorithm set includes: machine learning algorithm, deep learning algorithm, spatiotemporal analysis algorithm, convolutional neural network, random forest, logistic regression, linear regression, integrated learning method (such as bagging, boosting, etc.), generative adversarial network, etc.; in the specific model construction process, the system traverses multiple algorithms, compares their performance, and selects the optimal algorithm by itself; considering the adaptability and nonlinear processing capabilities, this embodiment uses deep learning algorithm (such as neural network) as the basic architecture; further selects a suitable deep learning architecture model, such as deep neural network (DNN), convolutional neural network (CNN), recurrent neural network (RNN), etc., and customizes the model architecture according to specific monitoring needs, adds or reduces the number of layers, adjusts the activation function, etc.; uses preprocessed data to train the model and optimizes the model parameters. During the training process, methods such as cross-validation (CV) can also be used to evaluate the model performance and select the optimal model basic architecture and AI algorithm set. The steps for training and verifying AI models include data segmentation, dividing the preprocessed data into training set, verification set and test set, and adjusting the model parameters during the training process to obtain optimal performance; the training set is used for model training, the verification set is used for model verification and hyperparameter adjustment, and the test set is used for final model evaluation; then the experimental results are verified and corrected based on and through actual measurements, and the data processing method is optimized.

[0056] In summary, the detection method and system of multiphase chlorinated hydrocarbon pollutants in soil and groundwater provided by the above embodiments of the present invention focus on the fact that the storage phases of chlorinated hydrocarbons in different types of soil mainly include gas phase, water phase, solid phase, free phase and other forms. By improving the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device and constructing a multiphase detection data analysis model, it is possible to achieve simultaneous detection of the multiphase storage concentration of chlorinated hydrocarbons in soil and groundwater environments, and more comprehensively evaluate the pollution level of chlorinated hydrocarbons in soil. It can be widely used in the identification of potential risks of soil pollution and the precise prevention and control of soil chlorinated hydrocarbon pollution, and can simplify the detection steps and processes, and improve the detection efficiency and accuracy.

[0057] It should be noted that in other embodiments of the present invention, other different schemes obtained by making specific selections within the scope of the steps, systems, thresholds, parameters, instruments, etc. recorded in the present invention can all achieve the technical effects recorded in the present invention, so the present invention will no longer list them one by one.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. All equivalent changes made according to the components, proportions and processes of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater, characterized in that: The following steps are involved: S1. Set up a multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device Set up at least one set of experimental equipment for detecting the concentration of multiphase chlorinated hydrocarbon pollutants in soil and groundwater, which includes: a host computer, a soil column experimental platform, and detection instruments such as gas chromatography-mass spectrometry and a capillary column; S2. Constructing a multi-phase detection data analysis model The multiphase chlorinated hydrocarbon pollutant detection data analysis model is constructed as follows: C = C Free phase + C Dissolved phase + C Residual phase + C Gas phase 1 Where: C, concentration of chlorinated hydrocarbon mixture, mg / L; C Free phase , concentration of chlorinated hydrocarbons in the free phase, mg / L; C Dissolved phase , concentration of chlorinated hydrocarbons in the dissolved phase, mg / L; C Residual phase , concentration of chlorinated hydrocarbons in the residual phase, mg / L; C Gas phase , concentration of gaseous chlorinated hydrocarbons, mg / L; S3. Conduct multi-phase detection experiments Through the multiphase chlorinated hydrocarbon pollutant concentration detection experimental device, multiphase detection experiments were carried out under homogeneous and heterogeneous soil column conditions. Multiple glass columns in the soil column experimental platform were used to carry out different chlorinated hydrocarbons. The migration experiment in different soil columns was carried out, and multiple sets of interrelated multiphase occurrence experimental data were obtained. S4. Conduct actual sample testing The multiphase chlorinated hydrocarbon pollutant concentration detection experimental device and the multiphase detection data analysis model are applied to the detection of actual samples, and the concentration data of other phases are calculated through the detection data of some phases to obtain complete multiphase chlorinated hydrocarbon pollutant detection data.

2. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 1, characterized in that: It also includes the following steps: S5. Construct a multi-phase chlorinated hydrocarbon pollutant detection system for simultaneous sample detection A multiphase chlorinated hydrocarbon pollutant detection system is constructed, which consists of a cloud server, a management terminal and a multiphase chlorinated hydrocarbon pollutant concentration detection experimental device. Multiple samples are detected and analyzed simultaneously, and the detection results of each detected sample are output.

3. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 1 or 2, characterized in that: Step S1 specifically includes: S1-1. Setting up soil column experimental platform Each soil column experimental platform includes: multiple detachable glass columns, multiple liquid containers, and multiple Suma jars. Soil is filled in each glass column to form a soil column group, and then each glass column and liquid container in the soil column group are connected by pipelines; a peristaltic pump and a flow divider are set on the pipeline in front of the water inlet end of each glass column; S1-2. Set up testing equipment Set up a host computer, a gas chromatography-mass spectrometer (GC-MS) and a capillary column as detection instruments, connect the GC-MS and the capillary column to the host computer, and connect the GC-MS and the capillary column to each soil column experimental platform; S1-3. From a large number of chlorinated hydrocarbons, three typical representative chlorinated hydrocarbons, carbon tetrachloride, chlorobenzene, and 1,2,4-trichlorobenzene, were selected as experimental target detection objects for the soil column experimental platform based on the detectability, toxicity and environmental persistence of high-risk organic toxic substances.

4. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 1 or 2, characterized in that: The step S2 of constructing a multi-phase detection data analysis model specifically includes: S2-1. Definition of multiphase concentration of chlorinated hydrocarbons Concentration of free phase chlorinated hydrocarbons: It is the concentration of chlorinated hydrocarbons that exist independently without being restricted or mixed with other phases, and is calculated using the law of conservation of concentration; Concentration of dissolved chlorinated hydrocarbons: It is the concentration of chlorinated hydrocarbons dissolved in soil pore water, obtained by CHCs soil column migration experiment and detection; The concentration of residual chlorinated hydrocarbons is the concentration of chlorinated hydrocarbons adsorbed on the surface of the soil solid phase, which is obtained by CHCs soil column migration experiment and detection; Concentration of gaseous chlorinated hydrocarbons: It is the concentration of chlorinated hydrocarbons in the soil in the form of gas, obtained by CHCs soil column migration experiment and detection; S2-2. Determine the relationship model between multiphase states in CHCs soil column migration experiment By analyzing the rules in the CHCs soil column migration experiment, the relationship model between the multiphase chlorinated hydrocarbon pollutant detection data was determined as follows: C = C Free phase + C Dissolved phase + C Residual phase + C Gas phase 1 Where: C, concentration of chlorinated hydrocarbon mixture, mg / L; C Free phase , concentration of chlorinated hydrocarbons in the free phase, mg / L; C Dissolved phase , concentration of chlorinated hydrocarbons in the dissolved phase, mg / L; C Residual phase , concentration of chlorinated hydrocarbons in the residual phase, mg / L; C Gas phase , concentration of gaseous chlorinated hydrocarbons, mg / L; S2-3. Verify the applicability of the test device and model Comsol was used to simulate the migration behavior of dissolved CHCs in soil, and the physical field control equation was used to verify the experimental device for detecting the concentration of multiphase chlorinated hydrocarbon pollutants and formula 1.

5. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 1, characterized in that: The step S3 of performing a multi-phase detection experiment specifically includes: S3-1. Filling of soil columns After each glass column is filled with soil, a soil column is formed. The soil column is filled by a dry filling method. After a plurality of soil columns are filled separately, a soil column group is formed. S3-2. Pretreatment of soil columns Before the soil column transport experiment begins, use CaCl2 solution to fully saturate the filled experimental column with water flow from bottom to top until the soil column is submerged, expel the air in the column and form a stable saturated flow field; S3-3. Collection of dissolved chlorinated hydrocarbons The mixture of carbon tetrachloride, chlorobenzene and 1,2,4-trichlorobenzene used in the experiment is passed into the soil column. The filtrate is collected from the bottom of the column in a certain time sequence and collected into a brown glass sample bottle without leaving any gaps and is immediately sealed and stored at low temperature. S3-4. Collection of gaseous chlorinated hydrocarbons During the introduction of CHCs, a cleaned Suma tank equipped with a sampler was used to collect samples at regular intervals, and air was pumped from the top of the soil column at a certain flow rate. After the completion of the extraction, nitrogen was introduced until the tank was filled with gas for dilution; S3-5. Collection of residual chlorinated hydrocarbons After the pollutant leaching is completed, the soil column is dismantled and the soil samples are taken out in an original state as much as possible. The cylindrical soil sample is cut into soil samples of different depths with a utility knife. After the soil samples are pre-processed before extraction, they are tested on the machine. S3-6, On-machine testing The collected samples were tested for the concentration of each pollutant using a gas chromatography-mass spectrometer, a capillary column and a host computer, and multiple sets of correlated multiphase chlorinated hydrocarbon pollutant concentration experimental data were obtained. S3-7. Repeat steps S3-1 to S3-6. Through the experimental device, multiphase detection experiments are carried out under homogeneous and heterogeneous soil column conditions respectively. Multiple glass columns in the soil column experimental platform are used to carry out migration experiments of different chlorinated hydrocarbons in different soil columns, and multiple groups of interrelated multiphase occurrence experimental data are obtained; the experimental data are analyzed to obtain the main influencing parameters, factors and change trends of multiphase chlorinated hydrocarbon pollutants in soil and groundwater.

6. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 5, characterized in that: The S3-1 soil column was filled with soils of different properties to obtain homogeneous and inhomogeneous soil column models. After subsequent testing steps, the detection data of multiphase chlorinated hydrocarbon pollutants in complex soil and groundwater environments were obtained.

7. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 1 or 2, characterized in that: The actual sample detection in step S4 specifically includes: S4-1, filling the actual sample to be tested into each organic glass column in the soil column experimental platform, repeating step S3, and using the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device to detect the concentration of some phases of chlorinated hydrocarbon pollutants in the actual sample; S4-2. Substitute the concentration data of some phases of chlorinated hydrocarbon pollutants detected into the multiphase detection data analysis model formula 1, and obtain the concentration data of other phases through calculation to obtain complete multiphase chlorinated hydrocarbon pollutant detection data. The occurrence concentration of multiphase chlorinated hydrocarbon pollutants in soil and groundwater can be obtained in one test.

8. The method for detecting multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 2, characterized in that: Step S5 also includes: S5-1. Construction of a multi-phase chlorinated hydrocarbon pollutant detection system Construct a multiphase chlorinated hydrocarbon pollutant detection system consisting of a cloud server, a management terminal and at least one set of multiphase chlorinated hydrocarbon pollutant concentration detection experimental device. S5-2. Conduct multi-link synchronous sample testing The detection system simultaneously detects and analyzes multiple samples filled into various plexiglass columns in a set of multi-phase chlorinated hydrocarbon pollutant concentration detection experimental equipment, and outputs the detection results of each detected sample.

9. A detection system for multiphase chlorinated hydrocarbon pollutants in soil and groundwater, characterized in that: It is used to implement the detection method according to any one of claims 1 to 8, characterized in that: The detection system includes: a cloud server, a management terminal and at least one set of multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device, and the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device includes a host computer, a soil column experimental platform, and detection instruments such as a gas chromatograph and a capillary column; The management terminal and the host computer are connected to the cloud server via the Internet respectively; the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental device is connected to the host computer; The cloud server is used to analyze and process the detection data uploaded by the host computer, and output the complete detection results of the concentration of multi-phase chlorinated hydrocarbon pollutants; The multiphase chlorinated hydrocarbon pollutant concentration detection experimental device is used to detect samples under experimental conditions and actual sampling; The host computer is used to control the work of the phase chlorinated hydrocarbon pollutant concentration detection experimental device, receive the detection data obtained by the phase chlorinated hydrocarbon pollutant concentration detection experimental device, and perform data preprocessing; Management terminal, used to input data and instructions to the cloud server or display the test results output by the cloud server; The soil column experimental platform comprises: a plurality of detachable glass columns, a plurality of liquid containers, and a plurality of Suma jars. Soil is filled in each glass column to form a soil column group, and then each glass column and liquid container in the soil column group are connected by pipelines; a peristaltic pump and a flow divider are arranged on the pipeline in front of the water inlet end of each glass column; The glass column comprises: a cylindrical hollow glass column with openings on both the upper and lower end surfaces, an upper glass cover, a lower bottom support, and a liquid outlet pipe, wherein the upper glass cover is arranged on the upper end surface of the glass column and is provided with an air lift hole and a liquid inlet hole penetrating the thickness of the glass cover; the lower bottom support is arranged at the lower part of the lower end surface of the glass column, and the liquid outlet pipe penetrates the thickness of the lower bottom support and communicates with the inner cavity of the glass column; The liquid inlet hole of each glass column is connected with the pipeline on the liquid inlet side through a liquid inlet pipe, and a flow control valve is also arranged on the liquid inlet pipe.

10. The detection system for multiphase chlorinated hydrocarbon pollutants in soil and groundwater according to claim 9, characterized in that: The cloud server also has a built-in multi-phase data analysis module, a multi-phase data AI processing module, and a multi-phase detection result output module; There are multiple sets of the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental devices, each set of the multi-phase chlorinated hydrocarbon pollutant concentration detection experimental devices is connected to a host computer, and the host computer has a built-in multi-phase data acquisition module; The host computer collects the detection data of the detection samples filled in each glass column in each set of multiphase chlorinated hydrocarbon pollutant concentration detection experimental device, and sends it to the multiphase data analysis module of the cloud server; the multiphase data analysis module sends the data to the multiphase data AI processing module after processing, and the data processed by the multiphase data AI processing module is finally output through the multiphase detection result output module.

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