134 results about "Isotope analysis" patented technology

The invention discloses a river nitrogen pollutant source analysis method based on drainage basin nitrogen turnover and isotope, and particularly relates to the technical field of water treatment.The river nitrogen pollutant source analysis method comprises the following steps that a drainage basin to be researched is selected, river water and soil samples in the drainage basin are systematically collected, and physical and chemical indexes and isotope indexes # imgabs0 # of the collected samples are tested. Nitrate marked by nitrogen isotope delta 15N / delta 18O and # imgabs1 # are used as key indication marks to perform high-precision identification on nitrogen sources in a river and an environmental system, the contribution proportion of different nitrogen sources to the nitrate concentration in a water body is quantified through a stable isotope analysis model, and the concentration of the nitrate in the water body is calculated. And in combination with data, the rates of denitrification and anaerobic ammonia oxidation in environmental samples, sediments and soil are directly measured through combined application of an isotopic tracer technology and a membrane inlet mass spectrometer technology.

The invention relates to an isotope-based underground water organic pollution traceability analysis method and system. The method comprises the following steps: collecting pollutant parameters of a monitoring point at a plurality of time intervals; constructing a target monitoring point set; the coverage area is called as a target area; discovering and analyzing pollutant parameters of each monitoring point in the target monitoring point set based on the typical time interval so as to obtain contour lines corresponding to pollutant parameter types; taking an area in the contour line corresponding to the high pollutant parameter of each pollutant type as a suspected area; and determining a target pollution source in the suspected area based on the isotope parameters. According to the method, big data monitoring resources are fully utilized in space and time, pollutant parameters are combined, isotope analysis resources are optimized and utilized, pollution sources are tracked and guided, and efficient multi-source burst differentiated pollutant traceability is provided.

The invention discloses a method for accurately deducting Sr double-charge interference in in-situ Ca isotope determination, and relates to the technical field of isotope analysis. According to the method, the Sr double-charge interference in the in-situ Ca isotope measurement is accurately deducted through an iteration method, the Ca isotope measurement result can be simply and quickly corrected, and high-resolution, low-detection-limit and high-flux Ca isotope measurement is realized; ca single-charge fractionation factors are calculated through an iterative method, and instrument quality discrimination correction and accurate deduction of Sr double-charge interference are simultaneously realized through formulas 1-5 in combination with the Sr isotope ratio; the method breaks through the application limitation of in-situ Ca isotope measurement, is suitable for high-Sr and low-Sr samples, solves the technical problems of in-situ Ca isotope analysis accuracy and analysis precision, fills the technical blank of Ca isotope measurement in the Sr-rich sample in laser in-situ detection, and provides a firm technical support for application in the field of geoscience.

The invention relates to the technical field of intelligent collection of rainfall samples, in particular to an intelligent collection system for rainfall isotope samples, which comprises an environment monitoring module, a sampling equipment control module, a sampling data acquisition module and a sampling data verification module, the wind direction and meteorological data of a deployment area are obtained, the opening and closing speed of a cover body of a sampling device is dynamically calculated, synchronous control is executed, and a chromaticity response curve and a flow response curve are constructed by combining high-frequency collection and delay correction of filtrate flow and chromaticity; extracting chromaticity mutation points through sliding window extreme value detection and threshold value comparison, and judging that the quality of the filtrate is abnormal; and on the basis of symmetric compensation and curve similarity evaluation, cover body opening and closing faults are identified, and dual verification of physical structure abnormity and sampling data validity in the sampling process is realized. The system can improve the representativeness and accuracy of the rainfall sample in a complex meteorological environment so as to ensure the stability and traceability of a subsequent isotope analysis result.

The invention discloses a plain small watershed nitrogen and phosphorus pollutant collaborative source analysis method, which belongs to the technical field of environmental pollution traceability, and comprises the following steps: 1, collecting multi-source basic data in a target plain small watershed, carrying out unified coordinate system, format and precision preprocessing, and constructing a watershed basic database; and 2, constructing a response relation model of various pollution sources and potential pollution loads on a GIS platform based on a drainage basin basic database, qualitatively identifying main pollution sources through spatial visualization analysis, and delineating key risk areas. According to the method, macroscopic spatial analysis, microchemical tracing and mathematical model calculation are organically fused, high-precision spatial data, hydrochemical and isotope analysis, multi-model quantitative analysis and uncertainty quantification are integrated, and high-precision and high-reliability cooperative source analysis of nitrogen and phosphorus pollutants is achieved.

The invention discloses an ultratrace mercury isotope analysis method, and relates to the technical field of environmental analysis. The method comprises the following steps: purging a liquid sample to be detected by nitrogen in a stannous chloride atmosphere, and trapping and concentrating mercury into a gold trapping tube; pyrolyzing the pyrolytic gold trapping tube to release mercury vapor; pyrolytic mercury vapor and thallium isotope internal standard aerosol are mixed to serve as a sample injection sample, and the sample injection sample is introduced into a multi-receiver inductively coupled plasma mass spectrometry; acquiring a mercury instantaneous signal and a thallium isotope signal; and calculating the mercury isotope ratio by adopting least square linear regression fitting in combination with a thallium internal standard ratio correction algorithm. According to the method, the instantaneous mercury isotope signal is generated by online combination of gold trapping and multi-receiver inductively coupled plasma mass spectrometry, the instantaneous signal is strategically collected and processed, the determination concentration of isotope analysis can be greatly reduced, the sensitivity of the method is remarkably improved, and direct determination of mercury isotope composition in a water sample with the concentration of 10 ng L <-1 > is met.

The invention discloses a fluid inclusion standard sample for in-situ isotope analysis as well as preparation and application of the fluid inclusion standard sample. 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 a fluid salt solution with the same mass in a closed Cu-Au tube, taking out a reaction product after the reaction, and drying to obtain the fluid inclusion standard sample for isotope analysis. According to the method, the silicate glass with uniform components can rapidly capture the fluid inclusion, and the Cu isotope in the fluid inclusion is accurately measured and controlled according to the fractionation degree of the Cu isotope between the acid salt melt and the fluid.

The invention discloses a device and a detection method for online oxidation-enrichment-reduction determination of nanogram-level nitrogen isotopes in a solid, and belongs to the technical field of nitrogen isotope analysis. The device comprises an oxidation system, a nitrogen oxide enrichment system, a nitrogen reduction system, a mass spectrum interface system, a stable isotope ratio mass spectrometer and pipelines for connecting all parts of the device. The device provided by the invention greatly reduces the quantitation limit of the nitrogen isotope in the solid sample, can realize high-precision determination of the nanogram-level nitrogen isotope in the solid sample, and has the advantages of simplicity and convenience in operation, high accuracy and the like.

The invention belongs to the technical field of isotope analysis, and particularly relates to a data correction method for measuring hydrogen and oxygen isotope components of plant water. The data correction method for measuring the hydrogen and oxygen isotope components of the plant water comprises the following steps: performing isotope spectrum measurement on the plant water to be measured to obtain delta18O plant water, delta2H plant water and residual R plant water; obtaining the corrected delta18O plant water in the to-be-detected plant water according to the correction curve formula 1; obtaining the corrected delta2H plant water in the plant water to be detected according to the correction curve formula 2; delta < 18 > O plant water correction = delta < 18 > O plant water-Y1 formula 1; delta 2H plant water correction = delta 2H plant water-Y2 formula 2. The correction method provided by the invention is simple to use, is widely applicable to the process of measuring the hydrogen and oxygen isotope component in the plant water by an isotope spectrometer, and can greatly improve the accuracy of a measurement result.

The present invention provides a pretreatment method for determining the stable isotope ratio of non-exchangeable hydrogen in acetic acid, belonging to the field of stable isotope analysis of foods. The pretreatment method comprises the following steps: adding a reaction reagent to a vinegar sample extract to replace the carboxyl hydrogen in the acetic acid with the exchangeable hydrogen to achieve isotope exchange equilibrium. The present invention can be used to simply and rapidly determine the isotope ratio of non-exchangeable hydrogen in acetic acid in vinegar products and can be used in research and applications for detecting the authenticity or adulteration of vinegar products.

The invention belongs to the technical field of chemical detection, and particularly relates to a Raman-LIBS-mass spectrometry combined analysis device and analysis method.The Raman-LIBS-mass spectrometry combined analysis device comprises a multiple reflection time-of-flight mass spectrometer, an LIBS spectrometer, a Raman spectrometer and a common module; the common module comprises a first incident light path system, a second incident light path system, a high-definition observation system, a vacuum sample bin, a vacuum system and a control system; the first incident light path system is used for generating a femtosecond laser beam and performing three-dimensional denudation on a sample; and the second incident light path system is used for combining the tunable laser into a resonant ionization light path. Compared with the prior art, in-situ micro-area ultrahigh-resolution element and isotope analysis and imaging can be achieved, ultra-trace element and isotope analysis and isotope ratio analysis under strong matrix interference are achieved, and meanwhile high-resolution molecular structure and composition analysis and Raman scattering imaging can be conducted.

The invention relates to a synthetic standard sample suitable for in-situ pyrrhotite Fe-S isotope analysis and a preparation method and application thereof, and belongs to the technical field of geological analysis and material analysis. The particle size of the synthesized standard sample is 100-150 microns, and the interior of the particle is compact and free of holes; delta 34S is equal to-1.16 + / -0.22 per mill, and delta 56Fe is equal to 0.39 + / -0.03 per mill; the delta 34S in the synthesized standard sample is detected by SIMS, and the standard deviation 2SD of the delta 34S is 0.53%. The delta 56Fe in the synthesized standard sample is detected by LA-MC-ICPMS, and the standard deviation 2SD of the delta 56Fe is equal to 0.47 per mill. The method has the advantages that the pyrrhotite is synthesized in a laboratory, the reproducibility of the synthesized standard sample is realized, and the problems that the original in-situ pyrrhotite Fe-S isotope standard sample is natural in source, very few in available quantity and non-reproducible are solved.

The application belongs to the technical field of chemical detection, and particularly relates to a Raman-LIBS-mass spectrometry combined analysis device and analysis method. The Raman-LIBS-mass spectrometry combined analysis device comprises a multiple-reflection time-of-flight mass spectrometer, a LIBS spectrometer, a Raman spectrometer and a shared module. The shared module comprises a first incident light path system, a second incident light path system, a high-definition observation system, a vacuum sample bin, a vacuum system and a control system. The first incident light path system is used for generating a femtosecond laser beam and performing three-dimensional ablation on a sample. The second incident light path system is used for combining tunable lasers into a resonance ionization light path. Compared with the prior art, the application can realize in-situ micro-area ultra-high resolution element and isotope analysis and imaging, realize ultra-trace element, isotope analysis and isotope ratio analysis under strong matrix interference, and can also perform high-resolution molecular structure and composition analysis and Raman scattering imaging.

Collection and separation systems, collection and separation methods, isotope analysis systems, methods of processing samples to analyze 15N, 13C, and 34S, and the like are provided. A system that includes a collection system in gaseous communication with a first device, wherein the collection system is configured to isolate two or more gases of a gaseous sample and configured to introduce each to a second device independently of one another is provided.

The present invention discloses a nitrogen isotope determination method for nitrogen in a gas sample, and relates to the technical field of isotope analysis, the method comprises: instrument performance pretreatment: before sample determination, determining that an instrument is in a stable working state by checking the vacuum degree, detecting the interference peak, tuning an ion source, and testing the stability and linearity of reference gas; according to the method, a glass sample bottle is adopted to collect a gas sample, and before collection, a bidirectional inert gas replacement-vacuumizing coupling sampling process is adopted to treat the sample bottle. Residual air in the sample bottle and air attached to the bottle wall are effectively removed, and the sample pollution risk is remarkably reduced; the CO2 adsorption trap adopts a gradient filling structure and is matched with a constant-temperature heating sleeve, so that the contact time of CO2 and an adsorption material is prolonged, meanwhile, the influence of adsorption heat release on the adsorption efficiency is avoided, and the CO2 removal rate is improved.

The present application relates to a kind of groundwater organic pollution tracing analysis method and system based on isotope, the method comprises: collecting the pollutant parameter of monitoring point in multiple time intervals;Build target monitoring point set;Its coverage area is called target area;Based on typical time interval, the pollutant parameter of each monitoring point in analysis target monitoring point set is found to obtain the contour line corresponding to pollutant parameter type;The area in the contour line of each pollutant type high pollutant parameter is regarded as suspected area;Determine target pollution source in suspected area based on isotope parameter.The present application fully utilizes big data monitoring resources from space and time, combines pollutant parameter itself and optimally uses isotope analysis resources, and the tracking of pollution source is guided to provide efficient multi-source burst differentiating pollutant tracing.

This invention discloses a quantitative method and system for the contribution of river nitrous oxide sources and fate processes, relating to the field of biotechnology. The method includes: collecting surface water and groundwater samples; determining the physicochemical properties of the water samples, including calculating and quantifying the water-to-groundwater exchange ratio; extracting dissolved nitrous oxide from the water samples after determining the physicochemical properties and performing isotope analysis on the nitrous oxide to generate isotope test results; conducting indoor culture experiments on the water samples after completing the isotope analysis to determine whether there are abiotic sources of nitrous oxide in the water samples, generating indoor culture results; and quantifying the contribution of river nitrous oxide sources based on the results of the water-to-groundwater exchange ratio, the isotope test results, and the indoor culture results. This invention effectively analyzes the sources and fate processes of nitrous oxide in rivers and accurately quantifies the contributions of different sources.

This invention relates to the field of mineral deposit exploration technology, specifically disclosing a method for determining the extension of magmatic hydrothermal deposits using fluid inclusions. The method involves collecting mineral samples containing fluid inclusions from the target deposit and its surrounding area using a systematic grid. Physicochemical parameters are obtained through petrography, microthermometry, and isotope analysis, and a spatial database is established. Multiple initial hydrothermal centers are identified. A multi-dimensional spatial constraint field is constructed, incorporating temperature-salinity-isotope gradients, mineralization depth, and magma-water mixing ratio. Using the initial centers as seed points, a neighborhood search is performed along the gradient synthesis direction. Sub-hydrothermal centers are generated and continuously grow when preset conditions are met, until an overlap threshold is reached, at which point iteration stops. All hydrothermal centers and growth paths are integrated to construct a spatial extension model. High-potential areas are screened using a target area evaluation index, and the extension direction and potential mineralization target areas are determined by combining the mineralization depth. This significantly improves the accuracy of concealed ore body prediction and the efficiency of mineral exploration.

This invention provides an apparatus, system, and method for analyzing altered carbonate carbon isotopes. The apparatus includes: an enrichment component comprising at least one enrichment tube having an enrichment section; and a freezing component comprising a container filled with a refrigerant. The enrichment section is completely immersed in the refrigerant to freeze the target gas generated by sample decomposition within the enrichment section to a target concentration. Based on the technical solution of this invention, analysis of low-content altered carbonate carbon isotopes can be achieved; it can also simultaneously acquire multiple sets of samples required for altered carbonate carbon isotope analysis, saving time for detecting large quantities of altered carbonate carbon isotopes. Furthermore, the operation is simple, reducing analytical costs and providing a reliable technical means for the application of geochemical exploration technology.

The invention relates to a river water quality influence evaluation method based on strontium isotope analysis and a radon model. Precise traceability is realized through a strontium isotope model technical method, and meanwhile, the influence of underground water of an irrigation area along a river on river water quality is quantified by applying a radon mass balance model. Specifically, by taking water quality analysis of the Yellow River irrigation area as an example, the method can accurately locate sources of complex pollutants such as carbonate rock weathering, soil mineral decomposition, chemical fertilizer loss and sewage leakage in underground water along the Yellow River irrigation area, solves the problem of confusion of natural and artificial pollution contributions, and fills the blank of underground water-surface water interaction influence quantification.

The present invention proposes a method for determining the stable isotope ratio of non-exchangeable hydrogen sites of glycerol in edible oils and fats, belonging to the field of stable isotope analysis technology. The method comprises the following steps: a) preparing a preliminary glycerol sample; b) determining the stable hydrogen isotope ratio of glycerol in the preliminary glycerol sample using a gas chromatography-pyrolysis-stable isotope ratio mass spectrometer; c) selecting glycerol with a known stable isotope ratio of non-exchangeable hydrogen sites as a working standard substance, processing according to step a), and determining according to step b) to obtain the stable hydrogen isotope ratio of the glycerol working standard substance; and calculating the stable isotope ratio of the non-exchangeable hydrogen sites of glycerol in the edible oil to be tested by comparing the measurement result of the stable hydrogen isotope ratio of the glycerol working standard substance with the known stable isotope ratio of the non-exchangeable hydrogen sites of the glycerol working standard substance. The method is rapid and accurate, providing a new analytical method for adulteration detection and authenticity control of oils and fats.

The invention discloses a laser freezing denudation device and method for a non-solid sample, and relates to the technical field of laser denudation-inductively coupled plasma mass spectrometry detection, the laser freezing denudation device comprises a sample cell main body, a heat dissipation end, a temperature sensing line, a liquid inlet liquid nitrogen pipeline, a silver objective table, a sample moving device and a multifunctional sample groove; wherein the heat dissipation end, the temperature sensing line and the liquid nitrogen inlet pipeline are sequentially arranged outside the sample cell main body side by side; the silver objective table and the multifunctional sample tank are arranged in the sample cell main body; a rotatable part of the sample moving device is arranged outside the sample cell main body; and the silver objective table is connected with the heat dissipation end, the temperature sensing line and the liquid nitrogen inlet pipeline. The device can effectively control the sample temperature, improve the data quality of fluid inclusion and biological sample test, provide an efficient and direct detection means without pretreatment for formation water and trace solution element-isotope analysis, and has the advantages of low instrument equipment and experiment cost, and strong economical efficiency and operability.

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.

The invention discloses a method and system for analyzing the accurate rate of nitrification and denitrification of soil based on nitrate nitrogen and oxygen isotopes. Compared with a traditional bag-burying culture method, the method has the advantages that a quantitative calculation equation of nitrification and denitrification rates is established by analyzing the dynamic change of the nitrogen and oxygen isotopes of the nitrate in the soil and combining an isotope mixing and fractionation effect model, so that accurate distinguishing and independent rate calculation of the conversion process of the two types of nitrogen are realized; the defect that the traditional method can only obtain the comprehensive net rate and cannot reveal the actual conversion process is effectively overcome, and the accuracy and timeliness of soil nitrogen process research are remarkably improved.

The invention discloses an amino acid derivatization method based on ester exchange and application of the amino acid derivatization method in bacterial amino acid stable carbon isotope measurement. According to the method, an alcoholic solution of boron trifluoride serves as a catalyst, carboxyl of amino acid reacts with ester groups in carboxylic ester, the ester groups are transferred to the amino acid, amino-acid ester is generated, and esterification of the carboxyl is achieved; and then carrying out acylation reaction on the amino-acid ester, triethylamine and acetic anhydride to realize acylation of amino groups. According to the method, chemical reagents causing damage to instruments do not need to be used, and generation of water in the reaction process can be avoided, so that the water removal step is omitted, the drying time is shortened, and meanwhile, side reactions and generation of by-products can be reduced. The method disclosed by the invention has good suitability with a stable isotope analysis instrument, can be used for rapidly and accurately determining the stable carbon isotope of the bacterial amino acid in an environmental sample, and has a wide application prospect in the aspects of establishing a bacterial amino acid monomer stable carbon isotope fingerprint database and widening an environmental microorganism traceability technical means.

A method for analyzing light n-alkane components and carbon isotopes in deep and ultra-deep source rocks includes: (S1) subjecting a 5 A molecular sieve column to aging; (S2) pyrolyzing a source rock; and allowing a pyrolysis product to enter the 5 A molecular sieve column; where n-alkanes are adsorbed and retained by the 5 A molecular sieve column; allowing an outflow to pass through a dividing plate and an empty column or a weak polarity column to be discharged; and (S3) performing programmed heating such that the n-alkanes adsorbed on the 5A molecular sieve column are successively desorbed according to molecular weight, and then pass through the dividing plate and the HP-5 or DB-5 column to enter a mass spectrometer for composition analysis or isotopic analysis.

The present invention discloses a method and electronic device for tracing the source of particulate phosphorus in water bodies. The method comprises: obtaining data on particulate matter from multiple sources within a study area; performing composite fingerprint factor analysis on inorganic particulate matter to obtain the inorganic particulate phosphorus contribution rates from multiple sources; performing isotope analysis on organic particulate matter to obtain the organic particulate phosphorus contribution rates from multiple sources; determining the adsorption-desorption equilibrium rates of particulate matter from multiple sources on phosphorus; and calculating the relative contribution rate of particulate phosphorus from each source based on the inorganic particulate phosphorus contribution rates from multiple sources, the organic particulate phosphorus contribution rates from multiple sources, and the adsorption-desorption equilibrium rates of particulate matter from multiple sources on phosphorus. By combining the multi-parameter advantages of composite fingerprint factors and the specificity of isotope technology, the present invention improves the accuracy and feasibility of tracing the source of particulate phosphorus in water bodies, provides more accurate tracing information, and achieves high-precision identification of the sources of particulate phosphorus in inorganic and organic particulate matter.

The invention discloses a mangrove plant community net primary productivity monitoring method based on trunk flow, and relates to ecology and botany. General regulations of mangrove plant community net primary productivity monitoring based on trunk stem flow, mangrove plant stem flow monitoring content and method, plant leaf and crown atmospheric stability isotope monitoring, mangrove plant community net primary productivity calculation method and other basic contents and requirements are given. The method comprises the following steps: monitoring the stem flow density of a sample tree by adopting a plant stem liquid flow monitoring system, obtaining the composition condition of plant leaf juice and 13C in the canopy atmosphere by adopting an isotope analyzer, and obtaining the canopy leaf area index by adopting a fisheye lens and related software; and calculating the real-time net primary productivity of the mangrove plant community according to the monitored data. The method can be applied to monitoring of net primary productivity of various mangrove forests or land forests. The method is accurate in monitoring, high in popularization degree and good in real-time performance, and solves the problems of poor continuity, high operation difficulty and the like in current mangrove plant community net primary productivity measurement and calculation.

The invention relates to the technical field of detection, and discloses a method for tracing the origin of silkworm cocoons based on a stable isotope technology in combination with a machine learning algorithm, and the method comprises the steps: (1) collecting data; (2) data preprocessing; (3) model optimization; (4) model training; and (5) producing area tracing. According to the invention, origin traceability of silkworm cocoons from different origins is realized based on isotope analysis and a machine learning algorithm. Specifically, hydrogen, oxygen, carbon and nitrogen stable isotope ratio data are combined with KNN, SVM and RF algorithms to realize rapid and high-precision source tracing of silkworm cocoon producing areas. According to the invention, by combining the advantages of various machine learning algorithms, the accuracy and reliability of silkworm cocoon origin tracing are improved.