42 results about "Isotope fractionation" patented technology

The invention discloses a deep coal rock in-situ gas content and adsorption / free gas proportion calculation method and device, and relates to the field of reservoir resource potential evaluation.The deep coal rock in-situ gas content and adsorption / free gas proportion calculation method comprises the steps that an isotope fractionation model coupled with a double-dispersion pore structure (matrix pores and kerogen pores) and a multi-gas transmission mechanism (viscous flow, Knudsen diffusion and surface diffusion) is constructed; the accumulated analytic gas quantity and the apparent isotope value of the produced gas obtained through solving are fitted with the actually measured accumulated analytic gas quantity and the apparent isotope value of the produced gas, and key parameters corresponding to the optimal fitting result are obtained; and determining the in-situ gas content, the in-situ adsorption gas proportion and the in-situ free gas proportion according to the productivity evaluation parameters at the initial moment corresponding to the optimal key parameters. According to the method, the in-situ gas content, the in-situ adsorbed gas proportion and the in-situ free gas proportion of the deep coal rock are calculated on the basis of an isotope fractionation model coupled with a double-dispersion pore structure and a multi-gas transmission mechanism, so that the gas resource content of the deep coal rock is predicted.

The invention provides a method for monitoring the degradation process of 3-chloroaniline, and relates to the technical field of water environment pollution remediation. According to the method, by combining multi-dimensional monomer isotope fractionation characteristics and experimental test results, theoretical calculation and experimental test are combined, possible degradation ways, degradation mechanisms and environmental attribution of 3-chloroaniline are deduced, and the results are complete and accurate. Compared with a mode of capturing and degrading intermediate products and free radicals only through a test means so as to reversely deduce a degradation pathway, the monitoring method provided by the invention can well make up the defects of experimental tests, deeply understand a degradation mechanism, more scientifically and reliably analyze the degradation pathway, the mechanism and the environmental destination of the pollutant 3-chloroaniline, and has a good application prospect. Key steps are favorably controlled, and the development of a high-efficiency and low-cost remediation technology for the polluted water environment is promoted.

The invention discloses a method for preparing deuterium-depleted water through cooperation of magnetic resonance and electrolysis strengthening, and particularly relates to the technical field of deuterium-depleted water preparation, and the method comprises the following steps: S1, injecting water to be treated into a magnetic resonance reaction chamber, and carrying out magnetic resonance treatment, so that the vibration energy level of a deuterium-oxygen bond is improved through a nuclear magnetic resonance effect, the bond energy is enhanced to 5.0-5.2 eV, and the deuterium-depleted water is obtained; forming a metastable-state deuterium-containing water molecular structure; s2, the water subjected to magnetic resonance treatment is guided into a three-electrode electrolytic bath for pre-electrolysis, then a gradient voltage electrolysis process is adopted for reinforced electrolysis to form a deuterium concentration gradient, and therefore hydrogen and electrolytic residual liquid are separated; and S3, finally performing gas-liquid isotope fractionation to finally prepare the deuterium-depleted water. According to the method, deuterium-oxygen bond energy is enhanced through magnetic resonance pretreatment, low-temperature gradient electrolysis and vacuum rectification are combined, a magnetoelectric synergistic isotope separation system is constructed, and the method has the advantages that the separation efficiency can be improved, the energy consumption can be reduced, the separation coefficient can be improved, the material utilization rate can be improved, and the deuterium content of the prepared deuterium-depleted water is lower than 30 ppm.

The present invention discloses a method for analyzing sources of Cd / Pb combined polluted farmland soil using bimetallic isotopes (Cd—Pb), comprising the following steps: collecting respectively a soil sample and risk source samples through a sample collection device; determining respectively Cd isotope ratio and Pb isotope ratio of the soil sample and the risk source samples; plotting by using the Cd isotope ratio and the Pb isotope ratio of the soil sample and the risk source samples as coordinates, to obtain a projection plot of the isotope ratios; recognizing a pollution end-member polluting farmland soil through the projection plot of the isotope ratios to obtain a recognition result for the pollution end-member, and then confirming the pollution end-member; and calculating a relative contribution rate of the pollution end-member, to obtain an analysis result for the source of isotopes. The present invention uses the two metal isotopes of Cd—Pb to mutually restrict and confirm each other to solve the problem of poor analytical accuracy caused by similar or overlapping isotope values of samples and isotope fractionation, and realizes accurate recognition and quantitative analysis for the source of heavy metals Cd / Pb pollution of farmland soil.

The invention discloses a soil microorganism carbon utilization efficiency determination method, and relates to the technical field of carbon utilization efficiency determination, and the method comprises soil sample pre-culture, multi-source 18O isotope gradient labeling, dynamic gas monitoring, microorganism respiration rate dynamic correction, and microorganism growth rate and carbon utilization efficiency acquisition. By labeling multi-source isotopes and quantifying contributions of different oxygen sources to microorganism DNA synthesis, underestimation of the carbon utilization efficiency caused by a traditional single labeling method is avoided, the problem of limitation existing in the current soil microorganism carbon utilization efficiency determination process is solved, the inhibition effect of too high local concentration on microorganism metabolism is reduced through gradient labeling, and the accuracy of soil microorganism carbon utilization efficiency determination is improved. The method has the advantages that marking uniformity is improved, multiple groups of soil samples are arranged, real-time change of microbial respiration is captured by means of dynamic monitoring, influence of isotope fractionation on carbon dioxide concentration calculation is eliminated, instantaneous errors of traditional static measurement are avoided, and accuracy of analysis results is improved to a certain extent.

The invention relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model. The shale or coal rock gas evaluation method comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of the real gas effect and the effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a relation between capillary pressure and saturation; 7, considering critical desorption pressure; 8, setting boundary conditions of initial conditions; 9, solving a control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history fitting; 12, verifying historical fitting quality; 13, predicting productivity; 14, calculating a gas dynamic output proportion; 15, identifying a fractionation inflection point and gas production mechanism conversion; by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theories, yield prediction of the deep reservoir and quantitative evaluation of the dynamic proportion of produced gas are realized.

The invention provides a multi-source constraint reverse modeling method and system for ancient lake water chemical condition evolution, and relates to the technical field of mineral resource exploration, and the method comprises the steps: rock core element scanning, ore-bearing section XRD analysis, and obtaining of ancient lake water ion composition; judging the water chemical type of the ancient lake based on the water ion composition of the ancient lake, and determining the basic evolution path of the water chemical condition; measuring carbon, oxygen and sulfur isotopes, and analyzing isotope fractionation characteristics and control factors; a multiphase fluid mixing model is defined, a Monte Carlo algorithm is adopted to solve the mixing proportion, and reaction network initialization is carried out; dividing time steps of fresh water injection, evaporation concentration, salt precipitation critical periods and the like, carrying out dynamic simulation calculation, constructing a loss function between actual measurement and simulation results, carrying out back propagation correction by adopting an Adam optimizer, and verifying and optimizing the simulation results. The method has good applicability to the numerical simulation of the chemical condition evolution process of the ancient lake water.

The invention relates to the technical field of environmental monitoring and analysis, and particularly discloses a method for distinguishing biological and chemical oxygen consumption pathways and application. According to the method, isotope information is deeply excavated from an oxygen consumption end by utilizing specific differences of oxygen isotopes in different oxygen consumption processes. According to a biological respiratory metabolism oxygen consumption process and an oxygen isotope fractionation rule related to reducing metal ions or compounds, residual oxygen concentration and isotope composition are changed according to a specific mode. A chemical probe is introduced as an auxiliary judgment, and a support is provided for further accurate judgment of oxygen consumption types by tracking dynamic changes due to the fact that degradation rates or products of probe molecules in biological and chemical oxygen consumption processes are different. Meanwhile, carbon isotope change monitoring is introduced, and deep key information behind the oxygen consumption process can be clearly known according to the isotope difference between the chemical oxidation organic carbon and the biological oxidation organic carbon. And the identification and distinguishing accuracy of the oxygen consumption source is improved according to the three dimensional indexes.

The present invention discloses a quantitative calculation method for the hydrogen and oxygen isotopes in surface water during the evaporation fractionation process in the field of isotope tracing technology, aiming to solve the problems of low calculation accuracy and large uncertainty in the existing calculation methods. It includes: analyzing the kinetic effect of the evaporation fractionation process; constructing the probability mass function of the isotope body and decomposing the ratio of the heavy / light isotope body; quantitatively describing the dissipation rate of the heavy / light isotope body in the evaporation fractionation; combining the water evaporation rate to obtain the change efficiency of the heavy / light isotope body during the evaporation fractionation process; and calculating the isotope body content in the remaining surface water. The present invention enhances the application adaptability of the calculation method to various conventional and extreme situations, reveals the isotope fractionation change law in surface water during the evaporation process, and improves the reliability of the results.

The application provides a method for analyzing the migration heterogeneity of chlorinated hydrocarbon pollution in groundwater in the southern mountainous area by combining isotope tracing and distributed sampling, and belongs to the field of environmental science and engineering technology. The method generates and optimizes the layout of sampling points automatically through a geographic information system (GIS), collects multi-medium samples of soil, water and air, realizes accurate determination of the content of pollutants and isotopes based on the global Moran index and by using isotope systems such as chlorinated hydrocarbon carbon isotopes, chlorine isotopes and radon isotopes. The migration parameters, isotope fractionation coefficients and pollution path probabilities are quantitatively analyzed by using a distributed heterogeneity weighted regression and a Bayesian network model, and the spatial variability and uncertainty are comprehensively explained. Finally, the analysis results are integrated on the GIS platform, and the migration heterogeneity distribution, migration hotspots and risk levels are dynamically presented by using a three-dimensional visualization tool, so that scientific support is provided for the prevention and control of chlorinated hydrocarbon pollution and risk assessment in the southern mountainous area.

The embodiment of the invention provides a cassiterite high-precision tin isotope determination method which comprises the following steps: selecting a cassiterite sample, grinding, and weighing the ground cassiterite sample; adding the weighed cassiterite sample into a sample dissolving tube, slowly adding high-purity hydrobromic acid into the sample dissolving tube, and heating and sealing the sample dissolving tube to completely dissolve cassiterite; taking out the dissolved sample, and diluting the dissolved sample to a constant volume; sequentially carrying out evaporation acid removal and redissolution on the diluted and constant-volume sample to obtain a sample to be measured; establishing a cup structure for Sn isotope static determination; and performing high-precision Sn isotope measurement on the to-be-measured sample according to the cup structure. According to the method, complete dissolution of cassiterite can be achieved, the extremely high tin recovery rate is ensured, the problem of extra isotope fractionation caused by solution volatilization in the processes of tin recovery incompleteness, dissolution and evaporation drying to medium conversion can be effectively solved, and therefore the accuracy and reliability of Sn isotope analysis are ensured.

The application discloses a fluid inclusion standard sample for in-situ isotopic analysis and a preparation and application thereof. The preparation method comprises the following steps: obtaining silicate glass powder with uniform components, carrying out high-temperature and high-pressure reaction on the glass powder and an equal mass of a fluid salt solution in a closed Cu-Au tube, taking out a reaction product after the reaction and drying the reaction product, and obtaining the fluid inclusion standard sample for isotopic analysis. The application can rapidly capture fluid inclusions in the silicate glass with uniform components, and accurately measure and control Cu isotopes in the fluid inclusions by the degree of Cu isotope fractionation between the acid salt melt and the fluid.

A system and method for quantification of carbon mineralization in basalt during carbon sequestration that includes: obtaining initial conditions at geological site which comprises establishing initial ratio conditions for at least two isotope systems; determining subsequent conditions after initiation of injection of a carbon dioxide source at the geological site; and determining mineralization characterization from performing multi-isotope fractionation analysis using subsequent conditions and initial conditions.

This invention discloses a method for accurately tracing geological hydrogen migration, belonging to the field of geological hydrogen exploration and migration tracing technology. The invention involves preparing stable hydrogen isotopes and radioactive tritium tracers with specific geochemical fingerprints and injecting them into target geological units; deploying a three-dimensional monitoring network including sensor arrays and automatic samplers to collect hydrogen concentration data and gas samples in real time; laboratory analysis to determine hydrogen isotope composition and rare gas concentrations, using an N2-He-Ar ternary diagram to identify gas sources and eliminate interference; integrating data and performing numerical simulations using migration control equations coupled with isotope fractionation effects, optimizing parameters through inversion algorithms; and generating a three-dimensional visualization map of hydrogen migration paths and a quantitative report based on the inversion results. This invention achieves a breakthrough in geological hydrogen migration from qualitative detection to quantitative tracking, significantly improving the reliability and accuracy of tracing, enabling real-time dynamic capture of the migration process, and providing precise decision-making basis for hydrogen exploration.

The application discloses a kind of determination methods of soil microbial carbon utilization efficiency, it is related to the determination field of carbon utilization efficiency, the application includes pre-culturing soil sample, multi-source 18 O Isotope gradient labeling, dynamic gas monitoring, dynamic correction of microbial respiration rate, microbial growth rate and carbon utilization efficiency acquisition, by multi-source isotope labeling, the contribution of different oxygen sources to microbial DNA synthesis is quantified, the low estimation of carbon utilization efficiency caused by traditional single labeling method is avoided, the limitation problem existing in the current soil microbial carbon utilization efficiency determination process is solved, gradient labeling reduces the inhibitory effect of local concentration on microbial metabolism, improves the uniformity of labeling, sets multiple soil samples, simultaneously uses dynamic monitoring to capture the real-time change of microbial respiration, eliminates the influence of isotope fractionation on carbon dioxide concentration calculation, avoids the instantaneous error of traditional static measurement, to a certain extent, the accuracy of analysis result is improved.

The invention discloses a rock cross-cut rubidium deposit rubidium occurrence state and deposit cause analysis method and device and a medium, and belongs to the technical field of deposit cause analysis. A first strain mode sample and a second strain mode sample are distinguished based on divergence characteristics of strain space distribution, and a first-class rubidium occurrence horizon and a first-class enrichment mechanism are judged by utilizing a space lag relationship between an isotope fractionation peak position and a strain peak position; and judging a second-class rubidium occurrence layer and a second-class enrichment mechanism according to a rubidium concentration gradient mutation position around the fluid inclusion, and coupling an enrichment direction of a sample scale with a fracture structure or a permeable stratum to delineate a mineralization area. According to the method, the lattice position quantitative judgment of the rubidium occurrence state, the dynamic process distinguishing of the mineralization mechanism and the geologic structure constraint delineation of the mineralization area are realized.

The application relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model, which comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of real gas effect and effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a capillary pressure and saturation relationship; 7, considering critical desorption pressure; 8, setting initial conditions and boundary conditions; 9, solving the control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history matching; 12, verifying the quality of history matching; 13, predicting productivity; 14, calculating gas dynamic output proportion; 15, identifying fractionation inflection points and gas production mechanism conversion; the application realizes the quantitative evaluation of deep reservoir production prediction and output gas dynamic proportion by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theory.

The invention relates to the technical field of mineral extraction, particularly discloses a method for efficiently extracting barite single mineral in black mudstone rich in organic matters, and solves the technical problems that micron-sized barite in black mudstone cannot be efficiently extracted in the prior art, lattice destruction / isotope fractionation of barite is easily caused in the extraction process, the purity and the recovery rate are low and the like. The purity of the extracted barite single mineral is larger than or equal to 99%, the recovery rate of fine-fraction barite is larger than or equal to 90%, crystal lattices are complete and free of damage, isotope fractionation and component change are avoided, and the high-precision geochemical test requirement can be met; meanwhile, the method is suitable for various sedimentary rocks such as marine / continental black mudstone, shale and siliceous mudstone, and the applicability is wide.

The invention discloses a shale / coal rock in-situ gas content and occurrence state quantitative evaluation method based on multi-method coupling. The shale / coal rock in-situ gas content and occurrence state quantitative evaluation method comprises the following steps: 1, establishing an on-site analysis experiment device; 2, implementing an on-site analysis experiment process; 3, processing data and summarizing parameters; 4, evaluating the in-situ gas content by using a USBM method; 5, evaluating the in-situ gas content by applying a polynomial method; 6, evaluating the in-situ gas content by applying an ACF method; 7, evaluating the in-situ gas content by applying an MCF method; 8, evaluating the in-situ gas content by applying an isotope fractionation method (CIF method); and 9, multi-method result comparative analysis and comprehensive evaluation. According to the method, a novel adsorption gas / free gas quantitative identification method is established based on an isotope fractionation mechanism, accurate quantitative characterization of the in-situ gas content and the gas occurrence state of the deep unconventional reservoir is realized, a scientific basis is provided for reserve evaluation, favorable target optimization and development scheme optimization, and the method has a wide application prospect. The method is suitable for both deep shale gas and deep coal and rock gas.

The present invention provides a method and system for delineating mineralization centers in porphyry-skarn deposits based on short-wave infrared spectroscopy, and relates to the technical field of mineralization centers of ore deposits. The present invention combines short-wave infrared spectral data with time series analysis, introduces time series analysis and dynamic mineralization probability distribution models, and combines the hydrothermal activity temperature calculated by oxygen isotope fractionation effect to construct a dynamic mineralization potential prediction framework, which can dynamically simulate the mineralization process and generate a prediction of the spatiotemporal distribution of target mineral mineralization centers. By introducing the time dimension, combining the mineralization stage division with oxygen isotope temperature inversion, and combining the three-dimensional geological model and dynamic prediction technology, the dynamic changes of the mineralization environment can be more accurately reflected, and the prediction accuracy can be improved. Thereby effectively optimizing resource allocation, reducing unnecessary exploration operations, and providing accurate guidance and scientific basis for mining exploration.

The invention discloses a system and a method for acquiring a geological fluid thermal action evaluation molecular fingerprint model. The system comprises a cracking yield evaluation module which is composed of a macroscopic viscosity reduction module and a microscopic bond breaking module, the macroscopic viscosity reduction module is used for evaluating the macroscopic viscosity reduction grade, and the microscopic bond breaking module is used for evaluating the microscopic bond breaking grade; the isotope fractionation evaluation module is used for metering carbon isotope values of methane, ethane, propane and coke pitch under the thermal action so as to determine the thermal synergy time action grade; the thermal action activation energy evaluation module is used for metering the difficulty degree of the target product generation condition and quantitatively determining the reaction effect grade of the thermal action; and the high-resolution miscellaneous bond evaluation module is used for evaluating the polymerization degree of the molecular evolution degree so as to evaluate the hydrocarbon generation grade of thermal evolution. The method has the beneficial effects that the crude oil cracking degree can be quantitatively evaluated in a high-precision manner.

The present application provides a kind of quantitative evaluation shale gas preservation condition method, comprising steps 1. Collecting gas sample to be evaluated area and carrying out natural gas component and isotope characteristic analysis.Step 2. Based on the kinetic Rayleigh fractionation model of carbon isotope in kerogen hydrocarbon generation process, the reaction process F of system is determined.Step 3. Determine the isotope fractionation factor ε.Step 4. The prediction of methane generation amount.Step 5. Quantitative characterization of natural gas dissipation efficiency.Step 6. Comprehensive evaluation of shale system preservation condition.The present application perfects the quantitative evaluation method of shale gas preservation condition, helps the comprehensive evaluation of shale preservation condition in complex tectonic deformation area of Sichuan Basin periphery, provides basis for the search of beneficial target area in shale gas exploration, and speeds up the exploration and development process of shale gas reservoir.

The invention discloses a high-temperature and high-pressure natural gas solubility determination and isotope fractionation simulation experiment device and method. The device comprises a gas supply module, a liquid supply module, an integrated reaction kettle, a vacuum module, an independent double-path gas collection module, a test analysis module and a computer control system. The method comprises the following steps: injecting a solution and natural gas into a reaction kettle until dissolution equilibrium, and introducing a state equation to directly calculate theoretical dissolved gas volume and solubility; independently collecting residual free gas in an equilibrium state and overall desolventized gas, determining isotopes, and calculating a thermodynamic equilibrium fractionation coefficient in the dissolution process; natural gas is induced to be continuously desolventized, instantaneous desolventized gas is collected in sections, isotopes are measured, and solvokinetic fractionation parameters are calculated in combination with a Rayleigh model. The whole process is completed in situ in the same kettle body, fluid transfer errors are thoroughly eliminated, and a reliable evaluation means is provided for deep natural gas reservoir forming simulation.

A system and method for quantification of carbon mineralization in basalt during carbon sequestration that includes: obtaining initial conditions at geological site which comprises establishing initial ratio conditions for at least two isotope systems; determining subsequent conditions after initiation of injection of a carbon dioxide source at the geological site; and determining mineralization characterization from performing multi-isotope fractionation analysis using subsequent conditions and initial conditions.

The invention discloses a method for measuring an element distribution coefficient and an isotope fractionation value between a fluid and a melt, and belongs to the field of stable isotope geochemistry, and the method comprises the following steps: preparing an initial fluid and an initial solid phase; performing isotope exchange reaction by using the initial fluid and the initial solid phase; an experimental fluid phase and an experimental melt phase in a reaction product are separated through freezing and deionized water cleaning; and determining the metal element content and stable isotope composition of the experimental fluid phase and the experimental melt phase, and calculating the metal element distribution coefficient and isotope fractionation value between the experimental fluid phase and the experimental melt phase. According to the method, after isotope exchange equilibrium of the rapid quenching cold-sealed autoclave, the fluid phase and the silicate rock phase are frozen and then separated, the fluid phase and the silicate rock phase are precisely separated and recovered through multi-step deionized water cleaning, precise analysis of the metal element content and the isotope composition of the two phases is achieved, and the analysis precision of the metal element content and the isotope composition of the two phases is improved. And the method has positive significance on isotope geochemistry development.

A carbonate rock stability prediction method based on calcium isotope fractionation characteristics, relates to the technical field of oil and gas development, including the following steps, collecting carbonate rock samples of the target area, obtaining the calcium isotope ratio δ 44 / 40 Ca and auxiliary geochemical parameters, wherein the auxiliary geochemical parameters include the content of Mg, Sr, Ca elements, and the content ratio of Sr / Ca, Mg / Ca elements, in combination with the calcium isotope ratio δ 44 / 40 Ca and Sr / Ca element content ratio test results, judge the sample diagenetic mode, based on the sample diagenetic mode, calculate the mineral recrystallization rate in the diagenetic process, calculate the rock stability index through the mineral recrystallization rate, and classify and predict the stability of the reservoir rock mass of the carbonate rock sample according to the rock stability index; the present application can accurately identify the early micro-recrystallization event hidden by traditional carbon and oxygen isotope means by using the mass fractionation effect of calcium isotope and the high sensitivity of calcium isotope system in low-temperature diagenetic environment.

The application discloses a method for determining lithium isotopes in coal by secondary ion mass spectrometry, and relates to the technical field of coal-based metal isotope determination; the application identifies the occurrence phase of lithium in coal before SIMS testing, and performs SIMS analysis in a single occurrence phase, so that the problem of poor lithium isotope testing accuracy caused by mixed occurrence phases is effectively avoided; in the SIMS testing, a reference material similar to the lithium occurrence phase in the coal sample to be tested in chemical composition and structure is used, a suitable correction strategy is proposed, the differences in secondary ion amounts and isotope fractionation under different matrix conditions are corrected, and the interference of the matrix effect is reduced; the occurrence phase of lithium is set to match the SIMS testing parameter combination, so that the secondary ion signal is more stable, and the testing repeatability is improved; the method disclosed by the application is helpful to realize stable and accurate in-situ determination of lithium isotopes in different occurrence phases in coal.

The invention discloses a high-precision star soil water ice hydrogen and oxygen isotope measurement method and system, and belongs to the technical field of space exploration, and the method comprises the following steps: S1, heating a water-containing ice star soil sample, and extracting all water vapor in the water-containing ice star soil sample; s2, introducing all the extracted water vapor into calcium carbide for heating reaction to generate acetylene gas and calcium oxide, and measuring the content of hydrogen isotopes in acetylene molecules; s3, carbon powder is introduced into calcium oxide generated in the step S2 for a heating reaction, carbon monoxide gas and calcium carbide are generated, and the content of oxygen isotopes in carbon monoxide molecules is measured. According to the method, hydrogen and oxygen elements in water molecules extracted from the water-containing glacial soil sample are efficiently converted into acetylene gas and carbon monoxide through high-temperature catalytic reaction, and the problem of isotope fractionation caused by the fact that water vapor adsorbs a pipe wall in a traditional method is effectively solved by utilizing the characteristic that the acetylene gas and the carbon monoxide gas are high in chemical stability; and the measurement precision is improved.

The invention belongs to the technical field of soil pollution treatment, and particularly relates to a method for determining a fractionation coefficient of a soil combined pollution interface and application. According to the invention, a combined pollution system is constructed by organic pollutants and heavy metals, and the system simulates the migration and transformation cross-interface process of the system in a real soil medium. On the basis, isotope determination is carried out on cross-interface transmission of pollutants in an aeration zone layer and a saturated zone layer interface, a Rayleigh fractionation model and a dynamics-thermodynamics fractionation theory are combined, an isotope fractionation coefficient in the migration process is accurately calculated, and quantitative analysis of a metal-organic pollutant composite migration mechanism is achieved.