42 results about "Stable nuclide" patented technology

The utility model relates to the technical field of gas transfer, and provides a sample introduction device for gas stable isotope value measurement, which comprises a containing tank with a containing space and a plurality of communicating pipes communicated with the containing space; the high-concentration gas injection pipe is arranged on the containing tank and communicated with the containing space, and high-concentration detection gas can enter the containing space through the high-concentration gas injection pipe. By means of the technical scheme, the technical problems that when a gas pre-concentration device is used in the prior art, gas cannot be directly supplied for high-concentration gas, the high-concentration gas can only be detected after being diluted in advance, the detection cost is increased, and the detection result has errors are solved.

The present application relates to a kind of detection methods of isotopic abundance in acetic acid, comprising the following steps: stable isotope labeled acetic acid is decomposed under vacuum and high temperature conditions, generates stable isotope labeled methane or carbon dioxide, can determine 13 C labeled in carboxyl site acetic acid CH3 13 COOH in 13 C isotopic abundance, 13 C labeled in methyl site acetic acid 13 CH3COOH in 13 C isotopic abundance, 18 O labeled acetic acid CH3C 18 O 18 OH in 18 O isotopic abundance, methyl deuterium isotopic abundance in deuterium labeled methyl site acetic acid CD3COOH;Compared with prior art, the present application has the advantages that the isotopic abundance in acetic acid labeled by stable isotope in different sites is detected, can be used for deuterium, 13 C or 18 O labeled acetic acid isotopic abundance determination, test data accuracy and precision etc.

The embodiment of the application provides a marine carbonate high-resolution sequence stratigraphic division method and device, and belongs to the technical field of geological exploration. The method comprises the following steps: obtaining logging data of a target well section, generating a first curve based on the logging data, the first curve being a curve for representing the rise and fall of the paleo-sea level of the target well section; obtaining stable isotope data of the target well section, correcting the first curve based on the stable isotope data, obtaining a second curve, and thus establishing a high-resolution sequence division scheme of a single well; obtaining a seismic profile of the target well section, determining a negative inflection point of the second curve, and calibrating the seismic profile based on different levels of the negative inflection point of the second curve, so as to determine a high-resolution sequence tracking scheme of the target well section; and the application can quickly and conveniently solve the problem of high-resolution sequence stratigraphic division and comparison.

The application relates to the technical field of plasma, in particular to a medical cyclotron beam centering adjustment method and system. The method comprises the following steps: acquiring a magnetic field sequence, a beam sequence and a current sequence; obtaining a beam fluctuation factor according to the difference in lag number corresponding to the maximum autocorrelation coefficient of the magnetic field sequence and the beam sequence, the correlation of the magnetic field sequence and the beam sequence, and the difference in the maximum autocorrelation coefficient; forming a beam fluctuation sequence by using the beam fluctuation factor; dividing the beam fluctuation sequence, and also dividing the current sequence; fitting a straight line based on the current fluctuation sequence and the current sequence; obtaining the current influence intensity at the current moment according to the difference between the excitation current in all sub-sequences and the overall excitation current of the current sequence and the mean square error; improving the proportional term according to the current influence intensity, controlling the excitation current based on the proportional term, and adjusting the proportional term in real time to optimize the magnetic field control effect. The application realizes higher and more stable nuclide production efficiency.

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.

The invention provides an experimental method for determining stable carbon and oxygen isotopes by a two-way sampling method, and relates to the technical field of stable isotope analysis. The experimental method comprises the following steps: selecting carbon dioxide gas with the purity of more than 99.999% as carbon dioxide reference gas, and selecting a calcium carbonate carbon and oxygen isotope standard substance and a target sample to be measured; and then the stable carbon and oxygen isotopes are determined through a two-way sample introduction method, standard gas does not need to be purchased, the isotope ratio of a sample relative to a standard substance is obtained through conversion application of a formula, finally, the isotope ratio is successfully calibrated to the value of international standard PDB, and the experiment cost is saved. The method can be widely applied to other stable isotope two-way sample introduction methods, principle communication is achieved, and determination can be conducted through the experimental method under the condition that no standard gas exists.

The invention relates to a pollution monitoring method and device based on stable isotopes, computer equipment and a storage medium. The method comprises the following steps: acquiring a volatilization fractionation parameter, a dissolution fractionation parameter and an adsorption fractionation parameter of a target pollutant and sample fractionation data corresponding to the target pollutant; constructing an initial evaluation model according to the volatilization fractionation parameters, the dissolution fractionation parameters and the adsorption fractionation parameters; training the initial evaluation model according to the sample fractionation data, and determining a target evaluation model; acquiring local fractionation data of the target pollutant; evaluating local fractionation data according to the target evaluation model, and determining fractionation data of a second target phase state of a target pollutant in a target environment; and determining the mass flux of the target pollutant in the target environment according to the local fractionation data and the fractionation data of the second target phase state, thereby efficiently monitoring the high-density non-aqueous phase liquid pollutant. The method can be adopted.

The invention discloses a preparation method of a tri-silicon isotope standard sample for a celestial body sample, and belongs to the field of geochemical stable isotopes. The method comprises the following steps: preparing two basic materials according to the average composition of the most representative silicate rock on the earth, decarbonizing, grinding and uniformly mixing; adding a silicon-29 diluent into one part of the basic material, and repeatedly sintering and grinding to obtain a material A; mixing a part of the material A with another part of the basic material, and sintering and grinding again to obtain a material B; the material B is subjected to sample dissolving and chemical purification to obtain a trisilicon isotope standard sample, MC-ICP-MS testing and silicon isotope abnormity calculation are carried out on the standard sample, it is found that the prepared standard sample is uniform in component and clear in non-mass-related fractionation signal, the standard sample can be used for correcting the mass discrimination effect in the analysis process of the sample to be detected, and the quality of the sample to be detected is improved. The silicon isotope abnormity in the celestial body sample is accurately identified, the accuracy and comparability of an analysis result are improved, and a reliable experimental reference is provided for planetary science and geochemical research.

The invention discloses a corrosion product deposition test method based on stable isotope tracing, which comprises the following steps: in a corrosion product out-of-pile deposition simulation test, actively adding a low-abundance isotope corrosion product into a loop, migrating the low-abundance isotope corrosion product in the loop and depositing the low-abundance isotope corrosion product on the surface of an alloy test piece, distribution of isotopes with different depths on the surface of the alloy test piece is analyzed after the test is carried out, and the oxidation film layer and the corrosion product deposition layer on the surface of the alloy test piece are distinguished. The invention provides a corrosion product deposition test method based on stable isotopic tracing, which comprises the following steps: artificially adding a low-abundance isotope corrosion product of an alloy into a test loop, so that the low-abundance isotope corrosion product migrates in the loop and is deposited on the surface of an iron-based alloy or a nickel-based alloy to form a corrosion product deposition layer; and distinguishing and identifying the oxidation film layer and the corrosion product deposition layer of the iron-based alloy and the nickel-based alloy in a stable isotope tracing manner.

The application discloses a method suitable for judging fluid migration direction of hydrothermal deposit, selects hydrothermal deposits with correlation in a study area; collects hydrothermal mineral samples from each hydrothermal deposit, determines and marks corresponding metallogenic stages of each hydrothermal deposit, divides the hydrothermal deposit into pre-mineralization stage, mineralization stage and post-mineralization stage based on the metallogenic stages; respectively tests stable isotopes of the hydrothermal mineral samples in the pre-mineralization stage, the mineralization stage and the post-mineralization stage, judges mineral stable isotope variation rules corresponding to the hydrothermal mineral samples in different mineralization stages; compares and studies the mineral stable isotope variation rules of the hydrothermal mineral samples in each mineralization stage of two or more hydrothermal deposits, regards a direction in which the mineral stable isotope variation rules of the hydrothermal deposits tend to be consistent as a fluid migration direction; selects another isotope for verification; the application regards the stable isotope variation rule as an effective means for tracing the source of the hydrothermal fluid of the deposit.

The invention discloses a stable isotope sample treatment workstation and a sample treatment method thereof, the workstation comprises a main frame, a liquid adding system and a gland system, the liquid adding system and the gland system are arranged in the main frame, the main frame comprises a workbench and a supporting frame on the upper side of the workbench, and the workbench is provided with a placing frame and an activating frame; the liquid adding device comprises a first transverse moving frame and a needle frame arranged on the first transverse moving frame in a liftable mode, a liquid adding needle is arranged on the lower side of the needle frame, the liquid sucking and discharging device is communicated with a liquid adding needle pipe, and the liquid adding device is matched with the liquid sucking and discharging device to work, so that a plurality of reaction liquid agents can be injected into the reaction bottles in sequence; the capping system comprises a second transverse moving frame, a cap falling device and a clamping device, the cap falling device and the clamping device are arranged on the second transverse moving frame, the second transverse moving frame transversely slides to drive the cap falling device to pass through the position above a reaction bottle, an aluminum cap can be hooked out by the reaction bottle and buckled to a bottle opening of the reaction bottle, and then the aluminum cap on the reaction bottle can be clamped through work of the clamping device. The subsequent reaction work can be smoothly carried out.

The invention discloses a device and a method for testing dissolved oxygen and ozone isotopes in water, and belongs to the field of gas stable isotope analysis and testing. Comprising a constant-pressure constant-current automatic sampling device and a gas sampling system, a certain volume of water sample in a sealed sample bottle is removed by using the constant-pressure constant-flow automatic sampling device for dissolved oxygen in water, the water sample is placed in the constant-temperature balance oscillation device for balancing, back flushing of a gas circuit is realized by using the gas sampling system, the influence of residual gas is eliminated, and then the sample is collected and purified. Purified gas passes through a multi-channel gas path switching system, separated oxygen is loaded into a gas stable isotope mass spectrometer, oxygen isotopes of dissolved oxygen are detected, and therefore automatic pretreatment of the dissolved oxygen in water and accurate testing of the three oxygen isotopes of the dissolved oxygen are achieved. According to the method, full-automatic operation is realized, man-made interference and air pollution are effectively avoided, and the detection precision and efficiency are remarkably improved.

The invention provides a multi-element monomer stable isotope source analysis method for chlorinated hydrocarbon in underground water, and relates to the field of underground water pollution traceability, the method comprises the following steps: constructing a three-dimensional isotope characteristic matrix according to a determined target pollutant and a corresponding carbon, chlorine and hydrogen monomer stable isotope system; the method comprises the following steps: arranging sampling points in a polluted site, collecting an underground water sample and pre-treating; performing isotope determination on the sample to obtain isotope data; constructing a fractionation model of carbon, chlorine and hydrogen isotopes; inputting the isotope data into a fractionation model for correction; and performing clustering analysis in a three-dimensional isotope space by using the corrected isotope data in combination with the three-dimensional isotope feature matrix, identifying different pollution sources, and performing result verification in combination with chemical fingerprint features and an underground water flow field model. According to the technical scheme, dependence on traditional concentration discrimination is weakened, and fine discrimination and contribution quantification between different pollution sources are achieved.

This invention discloses an online observation and calibration method for stable isotopes of atmospheric water vapor using laser spectroscopy. The method includes: acquiring standard water vapor and atmospheric water vapor stable isotope data; performing memory effect calibration by selecting a specific time period and limiting the standard deviation range to eliminate residual errors; calculating the minute drift between two consecutive concentrated standard sample tests to perform drift effect calibration over time; establishing a nonlinear fitting relationship between the difference in standard water vapor concentration and the difference in stable isotopes to perform concentration effect calibration; and finally, establishing a linear mapping relationship between the instrument's average test value at the reference concentration and the true value of the standard sample to complete the true value standardization. This invention systematically eliminates the comprehensive systematic errors such as memory, drift, and concentration generated in online laser spectrometer observations, ensuring the long-term accuracy and reliability of the observation data.

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.

This invention belongs to the field of ion source outlet angle measurement technology, and specifically relates to a device for measuring the outlet angle of a stable isotope separator ion source. The device includes a blind plate, with a first probe assembly and a second probe assembly mounted on the side wall of the blind plate. The first probe assembly includes a first housing, with a drive motor mounted on the side of the first housing. The output shaft of the drive motor is connected to a ball screw, and a first slide is threaded onto the surface of the ball screw. A first bellows pressure block is mounted on the first slide. This invention, by setting up the first and second probe assemblies and with a simple overall mechanical structure, achieves lower production costs while meeting functional requirements. Furthermore, the vacuum transition from high to low vacuum is more stable, reducing maintenance frequency and better ensuring the production capacity of stable isotopes, thus better meeting market demand for stable isotopes.

The present application relates to the field of ecological hydrological monitoring and artificial intelligence data processing, and provides a cold region ecological hydrological process analysis method and system based on stable isotope tracing, comprising: collecting stable isotope related data in alpine mountainous areas, constructing a multidimensional collaborative data set and performing data cleaning and feature extraction to obtain a multidimensional feature set containing stable isotope spatiotemporal variation, environmental factor characteristics and ecological hydrological process characteristics; constructing a distributed ecological hydrological model based on a mixed spatiotemporal network architecture and performing model training; inputting the multidimensional feature set of the region to be analyzed into the trained distributed ecological hydrological model, and outputting the quantitative contribution coefficients of four types of water cycle paths in the region from the feature fusion layer, including: atmospheric water vapor source contribution coefficient, frozen soil layer upper water river recharge proportion coefficient, precipitation contribution coefficient of soil water recharge, and soil water contribution coefficient of vegetation water use. The present application improves the recognition accuracy and stability of the water cycle path in alpine mountainous areas.

The invention provides a crab field rice authenticity identification method based on element and stable isotope conjoint analysis, and belongs to the technical field of crab field rice identification. According to the method, the rice field rice and the crab field rice are subjected to multi-element and stable isotope conjoint analysis, characteristic symbolic elements and stable isotopes which can be used for distinguishing the crab field rice and the rice field rice are screened in combination with stoichiometric analysis, then an orthogonal partial least squares discriminant analysis (OPLS-DA) model is established, the model can achieve 100% distinguishing of the rice to be detected, and the method has the advantages that the method is simple and convenient to operate, and the accuracy is high. The cross validation result of the model shows that R2Y is equal to 0.852, Q2 is equal to 0.802, the data interpretation capability and prediction capability of the model are good, and the 100-time replacement test result shows that the corresponding P values of R2Y and Q2 are smaller than 0.01, and the model is optimal.

The invention discloses a method for synchronously and efficiently monitoring the residual quantity of short-chain and medium-chain chlorinated paraffin in sediment, and relates to the technical field of environmental pollutant analysis. The method comprises the following steps: freeze-drying and grinding a sediment sample, mixing the sediment sample with a stable isotope internal standard, carrying out ultrasonic centrifugal extraction by adopting a dichloromethane and normal hexane mixed solution, and merging supernate; and then, purifying the extract liquor by using a straight-through EMR purification column containing Carbon S, collecting the purified liquor, carrying out nitrogen blowing concentration and solvent replacement, adding a sample introduction internal standard, and carrying out detection in a negative chemical ionization source mode by adopting gas chromatography-quadrupole time-of-flight mass spectrometry. By optimizing the pretreatment process, the dosage of the sample and the solvent is remarkably reduced, and the treatment time is shortened; by combining high-resolution mass spectrometry, the problem that the homologues of the SCCPs and the MCCPs are difficult to separate is effectively solved, synchronous, efficient and accurate quantification of the short-chain chlorinated paraffin and the medium-chain chlorinated paraffin in the sediment is realized, and the recovery rate is high.

The invention discloses a method for analyzing sulfur metabolites after grape fumigation, and relates to the field of agricultural product postharvest preservation, the method comprises the following steps: preparing experimental samples, and carrying out grouping design to obtain grouped grape samples; performing fumigation treatment on the experimental groups in the grouped grape samples by using stable isotope labeled sulfur dioxide gas to obtain fumigated grape samples; sampling and pre-treating the fumigated grape sample at a preset time point to obtain a sample solution at a series of time points; analyzing the sample solution at the series of time points by using a liquid chromatography-mass spectrometry technology to obtain mass spectrometry data of stable isotope information; and mass spectrum data based on the stable isotope information. According to the method, the cognitive leap from static content detection to dynamic process tracking is realized; safety evaluation is carried out through the identified key sulfur metabolites which are directly caused by fumigation and stably exist, so that the accuracy and perspectiveness of an evaluation result are improved.

The application belongs to the technical field of mass spectrometers, and particularly relates to a gas stable isotope magnetic mass spectrometer sampling system. The technical scheme is as follows: a gas stable isotope magnetic mass spectrometer sampling system, comprising an ampoule container, a plurality of ampoule bottles loaded with sample gas and / or standard gas are contained in the ampoule container, a gas distribution unit is connected to an outlet pipeline of the ampoule container, the gas distribution unit is connected with a plurality of sampling system pipelines, a plurality of container units are connected to the sampling system pipelines, the sampling system further comprises a sampling device, the sampling device is connected with the other ends of the plurality of sampling system pipelines, and the sampling system further comprises a pre-vacuum unit and a high-vacuum unit, the pre-vacuum unit is connected with the plurality of sampling system pipelines respectively, and the high-vacuum unit is connected with the sampling device and the plurality of sampling system pipelines respectively. The gas stable isotope magnetic mass spectrometer sampling system provided by the application can first draw a vacuum chamber to a pre-vacuum state and then to a high-vacuum state to ensure the vacuum degree of the system.

Described are techniques for distinguishing between biomethane and fossil methane using isotopic analysis. Examples include evaluating a methane source using radioisotope analysis stable isotope analysis. In some cases, radioisotope analysis is used for purposes of calibrating a stable isotope analysis technique or for verifying precision or reliability of a stable isotope analysis result.

The invention discloses a batch determination method and system for soluble inorganic carbon stable isotopes in river and lake water bodies, and belongs to the technical field of environment monitoring. Comprising the following steps: firstly, preparing a gas sample, pretreating to completely convert DIC in water into CO2, and measuring the concentration of CO2 and the isotope value of delta 13C-CO2 by using a Picarro G2201-i isotope analyzer; converting the measured CO2 concentration into a dissolved headspace concentration to obtain the DIC concentration of the water body; and based on the CO2 isotope values of the samples, calculating the delta 13C-CO2 isotope values of the samples in batches by using the standard curve. The method simplifies the DIC analysis process, improves the analysis efficiency and accuracy, has the advantages of simplicity and convenience in operation, high measurement speed, high data accuracy, wide application range and the like, provides an effective technical means for the fields of water body carbon cycle research, water quality monitoring, environmental protection and the like, and has important and wide application value.

The invention discloses a method for identifying mutton by using a stable isotope method, and relates to the technical field of animal product origin traceability, and the method comprises the following steps: (1) carrying out ossein extraction on sheep bones; (2) determining stable isotope delta 13C and delta 15N values of ossein extracted from sheep bones; (3) performing significant difference multiple comparison-Duncan analysis on delta 13C and delta 15N values of ossein in sheep bones by using statistical software; (4) carrying out PLS-DA partial least square discriminant analysis on delta 13C and delta 15N values of ossein in sheep bones by using statistical software; through further optimization of ossein extraction, the extraction efficiency of ossein is improved, rapid source tracing of mutton is realized, and the problems that in the prior art, the extraction process of ossein is long in time consumption, and the rapid source tracing requirement is difficult to meet are solved.

According to the present invention, it is possible to develop a technique whereby lysophosphatidylcholine and lysophosphatidic acid in a cerebrospinal fluid can be analyzed with high accuracy by an analysis method comprising a step for detecting lysophosphatidylcholine and / or lysophosphatidic acid in a biological sample by mass spectrometry, and a lysophosphatidylcholine compound of which the choline part contains stable isotopes is used as a standard sample.

This invention discloses a method for dissolving dual-labeled nitrogen gas in water ( 15 The preparation and quantification method of N2 standard samples belongs to the field of stable isotope analysis technology. This method will... 15 N-labeled ammonium chloride solution reacts with sodium hypochlorite in a completely sealed reaction flask filled with liquid and without a headspace, resulting in in-situ formation and dissolution. 15 N 15 Nitrogen gas was directly measured in its dissolved state in the liquid phase using membrane sample mass spectrometry (MIMS). 15 N 15 The m / z 30 characteristic signal of N was obtained by simultaneously monitoring the concentrations of residual monochloramine, dichloramine, and trichloramine in the reaction solution, and corrected based on the principle of nitrogen conservation. 15 N 15 The true concentration of nitrogen (N). This invention eliminates the need for gas collection, transfer, and cold trap purification throughout the entire process, avoiding nitrogen escape losses; chloramine correction significantly improves quantitative accuracy. It is simple to operate and allows for the flexible preparation of a series of concentration standards ranging from 10 to 1000 μmol / L. The signal drift of the standards is less than 3% within 30 days, making it suitable for isotope ratio mass spectrometry calibration, denitrification tracing, and isotope analysis of dissolved nitrogen in environmental water samples.

The present application relates to the technical field of biochemical analysis, in particular to a stable isotope labeling reagent for amino / azido / carboxyl compounds and a preparation method and application thereof. The stable isotope labeling reagent provided by the present application has the structural characteristics that one end is a carboxyl group, an alkyne group and a hydrazide group, and is connected with a reactive group of a target object, and the other end is a dimethyl-substituted tertiary amine group, so as to generate high-intensity fragment ions, and at the same time, groups with different mass differences of stable isotopes are realized, so as to reduce the interference of matrix effect on quantification.

This invention provides a method for analyzing the methane source in a soil-trunk continuum based on stable isotope tracing, belonging to the field of ecological environment monitoring and stable isotope tracing technology. This invention injects stable isotope-labeled methane gas into deep soil, giving soil-derived methane a identifiable tracer signal. Combined with stratified sampling of soil profiles at different depths and simultaneous multi-height monitoring of tree trunks, the migration process of methane from soil to tree trunks can be continuously tracked. Compared to existing methods that rely solely on the correlation between methane concentration and flux in tree trunks and soil for inference, this invention provides more direct source evidence. Furthermore, this invention uses artificially enriched stable isotope-labeled signals instead of natural background isotope signals as the primary criterion, effectively reducing the interference of fluctuations in natural isotope abundance signals and changes in environmental factors on the results, thereby improving the reliability of methane source identification in tree trunks.

The application discloses a preparation method of a three silicon isotope standard sample for celestial body samples, and belongs to the field of geochemical stable isotopes. The method comprises the following steps: preparing two basic materials according to the average composition of the most representative silicate rocks on the earth, and grinding and mixing the two basic materials after decarburization; adding a silicon-29 diluent to one of the basic materials, repeatedly sintering and grinding to obtain material A; mixing part of the material A into the other basic material, and again sintering and grinding to obtain material B; and obtaining the three silicon isotope standard sample through sample dissolution and chemical purification of the material B. Through MC-ICP-MS testing and calculation of silicon isotope anomalies of the standard sample, it is found that the prepared standard sample is uniform in composition, and the non-mass-related fractionation signal is clear, so that the prepared standard sample can be used for correcting the mass discrimination effect in the analysis process of a to-be-tested sample, accurately identifying silicon isotope anomalies in celestial body samples, improving the accuracy and comparability of analysis results, and providing a reliable experimental reference for planetary science and geochemical research.