Method for analyzing multi-monomer stable isotope source of chlorinated hydrocarbon in underground water
By constructing a three-dimensional isotope feature matrix and a fractionation model, combined with chemical fingerprinting and water flow field models, the problem of high-precision source tracing of multi-source chlorinated hydrocarbon pollutants was solved, and the accurate location and quantification of pollutant sources were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA UNIV OF GEOSCIENCES (WUHAN)
- Filing Date
- 2025-12-03
- Publication Date
- 2026-05-05
AI Technical Summary
Existing chlorinated hydrocarbon pollution tracing technologies cannot achieve high-precision, quantifiable pollution source identification and contribution analysis under conditions of multiple sources superimposed and significant degradation.
By constructing a three-dimensional isotope feature matrix and combining it with three types of stable isotope systems of carbon, chlorine, and hydrogen, a fractionation model was built. Isotope data correction and cluster analysis were performed, and the results were verified by combining chemical fingerprint features with a groundwater flow field model.
It significantly improves the ability to distinguish highly similar sources of chlorinated hydrocarbons, is applicable to scenarios with multiple pollution sources, and can accurately identify the original source of pollutants. Its applicability and accuracy are superior to traditional methods.
Smart Images
Figure CN121978226A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the fields of groundwater pollution source tracing and environmental isotope geochemistry, and in particular to a method for analyzing the source of multi-component stable isotopes of chlorinated hydrocarbons in groundwater. Background Technology
[0002] Chlorinated hydrocarbons (such as trichloroethylene (TCE), tetrachloroethylene (PCE), dichloroethylene (DCE), and vinyl chloride (VC)) are widely used in metal cleaning, electronics manufacturing, and chemical production. They are among the most common and difficult-to-treat volatile organic pollutants in groundwater. Their sources are complex, and pollution often exhibits characteristics of multiple points, multiple phases, and multiple processes overlapping. Traditional pollution source tracing technologies face the following limitations: 1. The chemical concentration method relies on the concentration distribution of pollutants, making it difficult to distinguish between chlorinated hydrocarbons of the same type from different sources. It is also susceptible to interference from hydrogeochemical processes such as groundwater flow and adsorption-desorption, resulting in low accuracy. 2. Single isotope tracing can identify some types of pollution sources, but it cannot quantify the contribution ratio of multiple pollution sources; 3. Hydrogeological simulation method: This method only uses water flow models to infer the pollution diffusion path, ignores the differences in the characteristics of the pollutants themselves, and is difficult to deal with scenarios with multiple pollution sources superimposed. 4. Existing multivariate methods lack a unified technical system, and chemical characteristics, isotope data, and hydrological parameters cannot be used to form a system that can be directly applied to source apportionment.
[0003] Therefore, there is an urgent need for a technology system centered on "stable isotopes of monomers" to achieve higher precision, stronger distinguishability and quantifiable pollution source identification by using the isotopic fingerprint changes of chlorinated hydrocarbons during reaction and migration. Summary of the Invention
[0004] The purpose of this invention is to provide a method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater by means of multiple monomers, in order to solve the problem that existing chlorinated hydrocarbon source tracing technologies cannot achieve high-precision and quantifiable pollution source identification and contribution analysis under conditions of multiple source superposition and significant degradation.
[0005] The above-mentioned objective of this application is achieved through the following technical solution: S1: Based on the chlorinated hydrocarbon composition of the contaminated site, determine the target pollutant and its corresponding carbon, chlorine, and hydrogen monomer stable isotope system, and construct a three-dimensional isotope characteristic matrix. S2: Set up sampling points in the contaminated site, collect groundwater samples and pre-treat them; S3: Perform isotope analysis on the pretreated sample to obtain isotope data; S4: Based on the reaction pathway of chlorinated hydrocarbons in groundwater, a fractionation model of carbon, chlorine and hydrogen isotopes is constructed. S5: Input the isotope data into the fractionation model for calibration; S6: Using the corrected isotope data and combined with the three-dimensional isotope feature matrix, cluster analysis is performed in the three-dimensional isotope space to identify different pollution sources, and the results are verified by combining chemical fingerprint features with the groundwater flow field model.
[0006] Optionally, step S2 includes: No fewer than 10 sampling points shall be set up, covering the core area, diffusion area and background area of the pollution plume; Pretreatment includes: enriching chlorinated hydrocarbons using solid-phase microextraction or purge-and-trap methods, and preparing purified samples suitable for carbon, hydrogen, and chlorine isotope determination.
[0007] Optionally, step S3 includes: The following instruments and conditions were used to perform isotope determination on the samples: δ 13 C was determined using gas chromatography-combustion-isotope ratio mass spectrometry at a combustion furnace temperature of 1000℃. δ 2 H was determined using gas chromatography-high temperature conversion-isotope ratio mass spectrometry; δ 37 Cl was determined using gas chromatography-quadrupole mass spectrometry; δ 37 In the determination of Cl, the standard average ocean chlorine was inserted as a standard substance and the determination was repeated three times, with the relative standard deviation controlled within 1.5%.
[0008] Optionally, step S4 includes: Fractionation models include the Rayleigh fractionation model and the second-order kinetic isotope fractionation model; The fractionation model includes the Rayleigh fractionation equation for describing the fractionation of chlorine isotopes during bioreductive dechlorination:
[0009] in, This represents the instantaneous isotope ratio. This represents the initial isotope ratio. The remaining reactant fraction. This is the fractionation coefficient.
[0010] Optionally, step S6 includes: Isotope data is δ 13 C、δ 37 Cl、δ 2 H data; Combining chemical fingerprint features refers to obtaining the concentration distribution of chlorinated hydrocarbons and their degradation products through non-target-target coupled techniques, and then verifying the consistency with isotope clustering results.
[0011] Optionally, step S6 may also include: Combining groundwater flow field models refers to using MODFLOW or ArcGIS to simulate groundwater flow direction, projecting isotopic data features along the flow direction, and determining whether they conform to the source-migration evolution trend.
[0012] An electronic device includes a processor, a memory, a user interface, and a network interface. The memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory to enable the electronic device to perform a method for determining the source of a multi-monomer stable isotope of chlorinated hydrocarbons in groundwater.
[0013] A computer-readable storage medium storing instructions that, when executed, perform a method for determining the source of multi-component stable isotopes of chlorinated hydrocarbons in groundwater.
[0014] The beneficial effects of the technical solution provided in this application are: 1. Significantly improves distinguishability: The multi-isotope mechanism can better distinguish highly similar sources of chlorinated hydrocarbons; 2. Wide range of applications: It can be applied to complex scenarios such as chemical industrial parks and landfills with multiple pollution sources, and its applicability is significantly better than the concentration method or the single isotope method; 3. Unaffected by degradation: Model correction of isotope fractionation can restore the source characteristics of pollutants, and even if pollutants undergo intensive biological dechlorination, their original source can be accurately identified; 4. Standardizable and engineering-promotable: Isotope determination, model calculation and result judgment all have clear operation and evaluation standards, which can directly provide reference models for related work. Attached Figure Description
[0015] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a step diagram of an embodiment of this application; Figure 2 This is a first analysis result diagram in an embodiment of this application; Figure 3 This is a second analysis result diagram in an embodiment of this application; Figure 4 This is a schematic diagram of the electronic device structure in the embodiments of this application. Detailed Implementation
[0016] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0017] The embodiments of this application provide a method for determining the stable isotope sources of chlorinated hydrocarbons in groundwater.
[0018] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating the steps of a method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater according to an embodiment of this application, including: S1: Based on the chlorinated hydrocarbon composition of the contaminated site, determine the target pollutant and its corresponding carbon, chlorine, and hydrogen monomer stable isotope system, and construct a three-dimensional isotope characteristic matrix. As one example, based on the composition of site pollutants, the main target pollutants (PCE, TCE, etc.) are selected, and their corresponding three-class monomeric stable isotope systems are established: carbon isotopes (δ¹²C, ... 13 C): Reflects the source and reaction pathway of pollutants; chlorine isotopes (δ¹⁴) 37 Cl: Highly sensitive to dechlorination reactions of chlorinated hydrocarbons; hydrogen isotope (δ) 2 H (optional): can help distinguish pollutants from different sources. The C–Cl–H three-dimensional isotope space matrix established in this invention is used to construct a pollution source feature fingerprint database, providing a foundation for subsequent source apportionment.
[0019] S2: Set up sampling points in the contaminated site, collect groundwater samples and pre-treat them; S3: Perform isotope analysis on the pretreated sample to obtain isotope data; S4: Based on the reaction pathway of chlorinated hydrocarbons in groundwater, a fractionation model of carbon, chlorine and hydrogen isotopes is constructed. S5: Input the isotope data into the fractionation model for calibration; As one example, isotopic data is input into a fractionation model for correction to eliminate the influence of the degradation process on the isotopic ratio.
[0020] As one example, the single isotope fractionation mechanism model is constructed as follows: Based on the dominant reaction pathways of chlorinated hydrocarbons in groundwater (biological reduction dechlorination, chemical oxidation, adsorption-desorption, etc.), fractionation coefficient models of carbon, chlorine, and hydrogen isotopes are constructed, including Rayleigh fractionation models and second-order reaction kinetic isotope models. The introduction of these models enables this invention not only to identify pollution sources but also to distinguish degradation pathways and reaction degrees, further enhancing the interpretability of pollutant migration directions and historical processes.
[0021] As one example, a multi-monomer stable isotope fusion framework. This is achieved by constructing a δ... 13 C—δ 37 Cl —δ 2 The three-dimensional fingerprint matrix of H is used in this invention to achieve source resolution using the following method: 1) Isotope fingerprint clustering: Multivariate statistical methods such as hierarchical clustering are used to identify different sources of pollutants; 2) Isotope correction: Combining fractionation models to perform reaction correction on isotope data, so that source apportionment is not affected by degradation processes; 3) C-Cl coupling discrimination: A trajectory model is established for the continuous dechlorination process of PCE-TCE-DCE-VC to distinguish between "homogeneous degradation" and "heterogeneous coexistence".
[0022] The key advantage of this method is that it can restore the source characteristics of pollutants even if they have been significantly degraded, thus achieving high-precision source identification.
[0023] S6: Using the corrected isotope data and combined with the three-dimensional isotope feature matrix, cluster analysis is performed in the three-dimensional isotope space to identify different pollution sources, and the results are verified by combining chemical fingerprint features with the groundwater flow field model.
[0024] As one embodiment, this invention proposes a multi-component stable isotope (C–Cl–H) synergistic characteristic matrix, combined with a chlorinated hydrocarbon degradation fractionation mechanism model, to construct a chlorinated hydrocarbon source apportionment technology system suitable for complex sites. This technology emphasizes the dominant role of "intrinsic isotope properties" in source tracing, weakens the dependence on traditional concentration discrimination, and achieves fine differentiation and contribution quantification among different pollution sources.
[0025] Step S2 includes: No fewer than 10 sampling points shall be set up, covering the core area, diffusion area and background area of the pollution plume; Pretreatment includes: enriching chlorinated hydrocarbons using solid-phase microextraction or purge-and-trap methods, and preparing purified samples suitable for carbon, hydrogen, and chlorine isotope determination.
[0026] As one example, sampling points are set up as follows: based on the hydrogeological conditions of the contaminated site (aquifer lithology, groundwater flow direction, permeability coefficient), at least 10 sampling points are set up in the core area, diffusion area, and background area of the contamination plume. 2-3L of groundwater sample is collected at each sampling point, and on-site parameters such as sampling depth, groundwater level, water temperature, and pH value are recorded.
[0027] As one example, sample pretreatment includes: organic enrichment: solid phase microextraction (SPME) or purge-and-trap (P&T) methods are used to enrich chlorinated hydrocarbons and metabolites in groundwater; isotope sample preparation: the enriched target pollutants are purified and separated to remove interfering impurities and prepare carbon, hydrogen and chlorine isotope analysis samples.
[0028] Step S3 includes: The following instruments and conditions were used to perform isotope determination on the samples: δ 13C was determined using gas chromatography-combustion-isotope ratio mass spectrometry at a combustion furnace temperature of 1000℃. δ 2 H was determined using gas chromatography-high temperature conversion-isotope ratio mass spectrometry; δ 37 Cl was determined using gas chromatography-quadrupole mass spectrometry, with reference to the method parameters in "Determination of Volatile Organic Compounds in Water by Purge and Trap / Gas Chromatography-Mass Spectrometry" (HJ639-2012); δ 37 In the determination of Cl, the standard average ocean chlorine was inserted as a standard substance and the determination was repeated three times, with the relative standard deviation controlled within 1.5%.
[0029] This application provides an embodiment as follows, δ 13 C uses GC-C-irMS; δ 2 H uses GC-HTC-irMS; δ 37 Cl was determined using GC-qMS. δ was measured. 13 C and δ 2 H used SPME to enrich pollutants; δ was measured. 37 Cl was enriched using a purge-traps method.
[0030] Measurement of δ 13 C and δ 2 The specific method was as follows: the combustion furnace temperature was set to 1000°C; the SPME conditions were: PDMS (100μm) coating, extraction temperature 25°C, extraction time 20 min, and elution time 4 min; saturated sodium chloride was added to the sample (to improve the gas-liquid partition ratio). The gas chromatography conditions were: Q column (30m × 0.32μm); injection port temperature 250°C; splitless injection; and a constant temperature program of 200°C. The standard reference for carbon isotope determination was Viennese Peedee belemnites; the standard reference for chlorine isotope determination was standard average ocean water (SMOW).
[0031] Measurement of δ 37 The specific method for determining chlorine isotopes (HCl) is as follows: Based on the instrument parameter settings of the standard "Determination of Volatile Organic Compounds in Water - Purge and Trap / Gas Chromatography-Mass Spectrometry" (HJ639-2012), the original standard method focused on pollutant concentration determination. This study, for the first time, extends this standard method to the determination of stable chlorine isotope ratios of individual pollutants in a complex VOCs system. During the analysis, standard and blank samples were periodically inserted to monitor instrument drift and background interference. The same sample was repeatedly tested continuously, and the δ¹⁸O values of the same pollutant were calculated. 37 Cl ensures accuracy and reliability. The δ value of PCE was measured three times consecutively for a given sample. 37The relative standard deviation of Cl was calculated to be 1.40%. The standard reference for the determination of chlorine isotopes was the standard average ocean chlorine (SMOC).
[0032] Step S4 includes: Fractionation models include the Rayleigh fractionation model and the second-order kinetic isotope fractionation model; The fractionation model includes the Rayleigh fractionation equation for describing the fractionation of chlorine isotopes during bioreductive dechlorination:
[0033] in, This represents the instantaneous isotope ratio. This represents the initial isotope ratio. The remaining reactant fraction. This is the fractionation coefficient.
[0034] Step S6 includes: Isotope data is δ 13 C、δ 37 Cl、δ 2 H data; Combining chemical fingerprint features refers to obtaining the concentration distribution of chlorinated hydrocarbons and their degradation products through non-target-target coupled techniques, and then verifying the consistency with isotope clustering results.
[0035] Step S6 also includes: Combining groundwater flow field models refers to using MODFLOW or ArcGIS to simulate groundwater flow direction, projecting isotopic data features along the flow direction, and determining whether they conform to the source-migration evolution trend.
[0036] As one example, the isotope results are directionally constrained by combining chemical fingerprint features and groundwater flow fields: Chemical fingerprint characteristics: Chemical fingerprints of pollutants in groundwater are obtained using non-target-target combined technology and analyzed in conjunction with isotope fingerprints. If the changes in the concentrations of chlorinated hydrocarbons and degradation products are consistent with the isotope indications, the reliability of source apportionment is enhanced; if they are inconsistent, it suggests the existence of multiple source superposition.
[0037] Groundwater flow field characteristics: The groundwater flow field in the study area was simulated using software such as MODFLOW and ArcGIS. Isotopic fingerprint features were projected along the flow direction to identify whether they conformed to the "source-migration" variation trend. If the isotopic variation was consistent with the flow direction, the reliability of the source analysis was enhanced; if they were inconsistent, it indicated the presence of lateral inflow or multiple source superposition.
[0038] In one embodiment, TCE / PCE source tracing in groundwater at an industrial contaminated site: Site Overview: The site is an existing salt chemical industrial base with a history of wastewater discharge and organic solvent storage tank leaks. Based on the occurrence conditions, hydrological properties, and hydraulic characteristics of groundwater, the groundwater in the area is classified into three main types: pore water in loose rocks, fissure pore water in red beds, and fissure water in igneous and metamorphic rocks. The groundwater flows from east to west. Sample collection: Ten sampling points were set up, including four monitoring wells in the public area (G1~G4) and six pollution diffusion monitoring wells (W1~W6). 2L of groundwater samples were collected at each point, and the pH range was recorded as 3.67-7.22 and the water level as 1.63-7.98m. Pretreatment and detection: According to the national standard "Determination of Volatile Organic Compounds in Water - Purge-Trap / Gas Chromatography-Mass Spectrometry" (HJ639-2012), the concentration of chlorinated hydrocarbons in groundwater was determined using a purge-trap-gas chromatography-mass spectrometry (GC-IRMS) system. The δ¹⁸O₂ concentration of chlorinated hydrocarbons in groundwater was determined using GC-IRMS. 13 C and δ 2 H value; determination of chlorinated hydrocarbon δ in groundwater using GC-qMS technology 37 Cl value.
[0039] Source tracing analysis: Within the study area, six types of chloroethylene were detected in three or more monitoring wells at high concentrations, indicating severe exceedance of standards. Based on existing groundwater flow direction, relative pollutant concentrations and spatial distribution characteristics, and isotopic information, pollutant source-sink characteristic analysis can be performed. ArcGIS was used to visualize VOC concentrations and stable chlorine isotope data, supplemented by stable carbon isotope data to explore their source-sink relationships.
[0040] (1) PCE Figure 2 The concentrations of PCE and some carbon and chlorine isotope analyses in each monitoring well are presented. The PCE concentrations generally decrease from upstream well W5 to downstream wells G1-G4 and W6. Due to concentration limitations, only W5 and G3 showed detectable values of PCE at a delta content. 13 The C-values, and the lack of significant difference between the two ratios, indicate that the PCE in the two wells are homologous. During migration, PCE may be reduced and dechlorinated by microorganisms, leading to fractionation of its chlorine isotopes. Over time, the remaining PCE becomes enriched in dichlorine isotopes. The δ¹⁸O value of PCE in W5... 37 The positive Cl concentration compared to G1-G4 further suggests that PCE in W5 and the four wells in the common area may not have a source-sink relationship. The lower PCE concentrations in wells W4 and W2, and their lower δ... 37The Cl values are all negative, and considering the water flow direction, these two wells do not have a source-sink relationship for PCE compared to other wells. The PCE concentration in well W6 is lower than that in G1, and its δ37Cl concentration is very close downstream of the groundwater level, indicating that the PCE in W6 may originate from G1.
[0041] (2) TCE Depend on Figure 3 It can be seen that TCE was detected in all monitoring wells, with higher concentrations in wells W5 and the four wells G1-G4 in the common area. TCE readily undergoes bioreduction dechlorination in groundwater, leading to the enrichment of carbon and chloride heavy isotopes in TCE over time due to migration or degradation. The TCE in the upstream well W5 showed significant 37Cl depletion, with a higher δ¹⁷C concentration compared to the downstream monitoring wells G1-G4, W1, and W6. 37 The negative Cl content indicates that well W5 may be a source of TCE contamination, which degrades with groundwater flow and can migrate to wells G1-G4, W1, and W6. The upstream well W4 has a lighter Cl isotope than wells W2 and W3, suggesting the possibility of TCE migrating from W4 to wells W2 and W3. This process involves degradation, hence the heavier Cl isotope. The δ¹⁸O⁻ content in well W5... 13 The C value is similar to that of G3, further illustrating the homology between W5 and G3. However, the δ value of TCE in G4... 13 The C value differs significantly from that of W5 and G3, indicating that TCE in G4 may have other sources. Based on the above results, it is judged that well W5 is likely the main source of TCE pollution in the study area, and it will migrate and spread to downstream monitoring wells with groundwater.
[0042] This application also discloses an electronic device. (See reference...) Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. The electronic device 500 may include: at least one processor 501, at least one network interface 504, a user interface 503, a memory 505, and at least one communication bus 502.
[0043] The communication bus 502 is used to enable communication between these components.
[0044] The user interface 503 may include a display screen, and optionally, the user interface 503 may also include a standard wired interface or a wireless interface.
[0045] The network interface 504 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface).
[0046] This application also discloses a computer-readable storage medium storing multiple instructions adapted for loading by a processor to execute the above-described method for determining the source of multi-component monomeric stable isotopes of chlorinated hydrocarbons in groundwater.
[0047] The above are merely exemplary embodiments of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure.
[0048] This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described in this disclosure. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.
Claims
1. A method for analyzing the stable isotopic sources of multi-component monomers of chlorinated hydrocarbons in groundwater, characterized in that, The method includes the following steps: S1: Based on the chlorinated hydrocarbon composition of the contaminated site, determine the target pollutant and its corresponding carbon, chlorine, and hydrogen monomer stable isotope system, and construct a three-dimensional isotope characteristic matrix. S2: Set up sampling points in the contaminated site, collect groundwater samples and pre-treat them; S3: Perform isotope analysis on the pretreated sample to obtain isotope data; S4: Based on the reaction pathway of chlorinated hydrocarbons in groundwater, a fractionation model of carbon, chlorine and hydrogen isotopes is constructed. S5: Input the isotope data into the fractionation model for calibration; S6: Using the corrected isotope data and combined with the three-dimensional isotope feature matrix, cluster analysis is performed in the three-dimensional isotope space to identify different pollution sources, and the results are verified by combining chemical fingerprint features with the groundwater flow field model.
2. The method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater as described in claim 1, characterized in that, Step S2 includes: No fewer than 10 sampling points shall be set up, covering the core area, diffusion area and background area of the pollution plume; Pretreatment includes: enriching chlorinated hydrocarbons using solid-phase microextraction or purge-and-trap methods, and preparing purified samples suitable for carbon, hydrogen, and chlorine isotope determination.
3. The method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater as described in claim 1, characterized in that, Step S3 includes: The following instruments and conditions were used to perform isotope determination on the samples: δ 13 C was determined using gas chromatography-combustion-isotope ratio mass spectrometry at a combustion furnace temperature of 1000℃. δ 2 H was determined using gas chromatography-high temperature conversion-isotope ratio mass spectrometry; δ 37 Cl was determined using gas chromatography-quadrupole mass spectrometry. δ 37 During the determination of Cl, the standard average ocean chlorine was inserted as a standard substance and the determination was repeated three times, with the relative standard deviation controlled within 1.5%.
4. The method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater as described in claim 1, characterized in that, Step S4 includes: Fractionation models include the Rayleigh fractionation model and the second-order kinetic isotope fractionation model; The fractionation model includes the Rayleigh fractionation equation for describing the fractionation of chlorine isotopes during bioreduction dechlorination: in, This represents the instantaneous isotope ratio. This represents the initial isotope ratio. The remaining reactant fraction. This is the fractionation coefficient.
5. The method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater as described in claim 1, characterized in that, Step S6 includes: Isotope data is δ 13 C、δ 37 Cl、δ 2 H data; Combining chemical fingerprint features refers to obtaining the concentration distribution of chlorinated hydrocarbons and their degradation products through non-target-target coupled techniques, and then verifying the consistency with isotope clustering results.
6. The method for analyzing the stable isotopic sources of chlorinated hydrocarbons in groundwater as described in claim 1, characterized in that, Step S6 also includes: Combining groundwater flow field models refers to using MODFLOW or ArcGIS to simulate groundwater flow direction, projecting isotopic data features along the flow direction, and determining whether they conform to the source-migration evolution trend.
7. An electronic device, characterized in that, The device includes a processor, a memory, a user interface, and a network interface. The memory is used to store instructions, and the user interface and network interface are used to communicate with other devices. The processor is used to execute the instructions stored in the memory to enable the electronic device to perform the method for determining the multi-monomer stable isotope source of chlorinated hydrocarbons in groundwater as described in any one of claims 1-6.
8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed by a computer, perform the method for determining the source of multi-component stable isotopes of chlorinated hydrocarbons in groundwater as described in any one of claims 1-6.