43 results about "Isotopic ratio" patented technology

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 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 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.

An isotope ratio spectrometer is operated for measurement of a sample. First isotope ratios and first signal intensities are measured for a reference in the spectrometer, over a first measurement time period. A first relationship comprising a relationship between the first isotope ratios and the first signal intensities is determined. Sample isotope ratios and sample signal intensities are measured in the spectrometer, over a second measurement time period subsequent to the first measurement time period. Second isotope ratios and second signal intensities for a reference are measured in the spectrometer, over a third measurement time period subsequent to the second measurement time period. A second relationship comprising a relationship between the second isotope ratios and the second signal intensities is determined. A reference isotope ratio is estimated for a time X within the second measurement time period, based on the first relationship and the second relationship.

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.

The application discloses a kind of gas isotopic ratio measurement system and method, it relates to gas isotopic measurement technical field, in the system, double-layer sealed panning gauge is used to obtain the mixed gas to be measured, after energization, make the mixed gas to be measured occur panning discharge, produce the light signal containing each isotopic characteristic spectrum;Double-layer sealed panning gauge includes gauge tube, coaxially arranged inner layer sealing structure and outer layer sealing structure;Lens group is used to collect and focus light signal;Optical fiber is used for remote transmission light signal collected by lens group;Spectrometer is used for the light signal transmitted by optical fiber is spectrally resolved, forms the spectrum according to wavelength development;Photoelectric detector is used to convert spectrum into electrical signal;Computer is used to determine the proportion of each isotopes in the mixed gas to be measured according to electrical signal.The application realizes redundancy protection by double-layer sealing structure, ensures that discharge condition is stable under harsh environment, prevents gas leakage, realizes high-precision and safe measurement of gas isotopic ratio under high-risk scene.

The application provides a single inclusion carbon dioxide carbon-oxygen isotope measurement method, relates to the technical field of isotope measurement, and comprises the following steps: S1, selecting at least two standard carbon dioxide samples; S2, obtaining Raman spectrum data of all standard carbon dioxide samples and a to-be-measured inclusion sample at different temperatures; S3, constructing a standard model according to the Raman spectrum data of all standard carbon dioxide samples; S4, inputting the Raman spectrum data of the to-be-measured inclusion sample at different temperatures into the standard model, obtaining an isotope ratio curve of the to-be-measured inclusion sample, and calculating a to-be-measured carbon isotope characteristic of the to-be-measured inclusion sample according to the fact that the interval between the isotope ratio curves is proportional to the difference between carbon isotope ratios. The application has the beneficial effect that Raman spectrum detection is directly performed on the inclusion, the limitation that a sample needs to be destroyed in a traditional mass spectrometry method is avoided, and nondestructive and high-precision measurement of the carbon-oxygen isotope ratio of carbon dioxide in a single inclusion can be realized.

The application discloses a marine organism fossil U-Pb dating method based on LA-ICP-MS, and comprises the following steps: S1, according to stratigraphic division, marine organism fossils and iron manganese oxides of each layer are selected from a deep sea sediment column, and the rest is taken as a sediment residue; S2, the marine organism fossils are cleaned, and marine organism fossil target samples are prepared; S3, a laser ablation inductively coupled plasma mass spectrometer is used to perform laser ablation, point marking, sequencing and testing on the marine organism fossil target samples, and uranium lead isotope data is obtained; S4, baseline deduction and mapping are performed on the uranium lead isotope data, the lead isotope ratio of the sediment residue is anchored as an initial value to perform ordinary lead correction, and the age data of the marine organism fossils is obtained; the laser ablation mode is a line scanning mode. The marine organism fossil U-Pb dating method realizes dating test of marine organism fossils, and has high determination accuracy.

A pharmaceutical composition for isotope-selective modulation including at least one isotope selected from the group consisting of 1H, 6Li, 12C, 10B, 14N, 16O, 17O, 24Mg, 26Mg, 28Si, 29Si, 32S, 33S, 39K, 35Cl, 40Ca, 42Ca, 43Ca, 50V, 50Cr, 52Cr, 54Fe, 56Fe, 58Ni, 60Ni, 61Ni, 63Cu, 64Zn, 66Zn, 92Mo, 94Mo, 95Mo, 96Mo, 74Se, 76Se, 77Se, 78Se, 70Ge, 72Ge, 73Ge, 79Br, 85Rb, 107Ag, 130Ba, 132Ba, 134Ba, 135Ba, and 136Ba, wherein said at least one selected isotope is enriched to exceed its relative isotopic ratio found in a naturally occurring sample of the same chemical element. Methods for its use include investigating the isotopic signatures, intervening with isotopic fractionation in mammals.

The invention belongs to the technical field of shale oil and gas development, and discloses a shale oil-gas-bearing potential multi-parameter collaborative evaluation method. The method integrates six experimental technologies of nitrogen adsorption, carbon dioxide adsorption, carbon and oxygen isotope, rock pyrolysis and XRD total rock / clay analysis, and comprises the core steps of obtaining multi-dimensional data such as a pore structure, mineral composition, organic matter characteristics, an isotope ratio and the like after standardized pretreatment of a shale sample, and performing parameter correction, weight distribution and collaborative modeling to obtain a shale sample. And quantifying the oil-gas potential index and grading. The method solves the problem that traditional single parameter evaluation is insufficient in accuracy, data are comprehensive and reliable, and key technical support is provided for shale oil and gas exploration and development and reservoir evaluation.

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 discloses a carbon sequestration area determination method and device, a storage medium and an electronic device, and the method comprises the steps: carrying out the component analysis of underground water data of different geological stratums in a candidate sequestration area, and obtaining the isotope ratio of the same chemical composition, the isotope ratios are generated from chemical compositions and isotopes of the chemical compositions in the groundwater data, the different geological stratums include overground cover stratums and underground reservoirs, and the isotope ratios include a first isotope ratio of the overground cover stratums and a second isotope ratio of the underground reservoirs; according to the ratio change value of the first isotope ratio and the ratio change value of the second isotope ratio, determining the sealing grade of the candidate sealing region; and determining the candidate sequestration area as a carbon sequestration area under the condition that the closure level is determined to be higher than the preset level. By adopting the technical scheme, the problem that the storage area cannot be accurately determined is solved.

The present invention may be applied to a measuring device capable of measuring a concentration ratio between carbon isotopes in carbon dioxide. One embodiment of the present invention comprises: a light source unit; a sample gas cell which is positioned on an optical path irradiated from the light source unit; a gas cell band-pass filter unit which is positioned on the optical path which has passed through the sample gas cell, and is provided with a first band-pass filter and a second band-pass filter, the first band-pass filter having formed therein a sealed space in which a gas containing a first isotope is present, and the second band-pass filter having formed therein a sealed space in which a gas containing a second isotope, which is a different isotope of the same element as that of the first isotope, is present; and a light receiving unit.

This invention relates to the field of analytical chemistry, and more particularly to an analytical method for determining the hafnium content in nuclear-grade zirconium alloys. The analytical method includes the following steps: Step S2: Dissolving a metallic or oxide hafnium isotope in concentrated hydrochloric acid and concentrated hydrofluoric acid to prepare an isotope diluent stock solution; Step S2: Adding a corresponding hafnium single-element standard solution to the isotope diluent stock solution, determining the isotope ratio R value, and calibrating the concentration of the diluent solution; Adding the calibrated isotope diluent solution to the zirconium alloy, dissolving the zirconium alloy sample in concentrated hydrochloric acid and concentrated hydrofluoric acid to obtain a sample solution to be separated; Performing extraction chromatography on the sample solution to obtain a hafnium-containing test solution; Determining the hafnium content in the hafnium-containing test solution using inductively coupled plasma mass spectrometry. This invention can accurately determine the hafnium content in nuclear-grade zirconium alloys, improving the stability and accuracy of the analytical results.

According to the rubidium isotope proportion measuring device and method based on the nuclear spin slowing factor, two beams of orthogonal laser are driven through an automatic upper computer, magnetic resonance frequencies of a high-temperature alkali metal air chamber in different bias magnetic fields are searched under different optical powers, the gyromagnetic ratio is calculated through linear fitting, and therefore the nuclear spin slowing factor of an atom ensemble is obtained, and the rubidium isotope proportion measuring method based on the nuclear spin slowing factor is obtained. And solving an overdetermined equation set by using the relationship between the slowdown factor and the isotope proportion and the rubidium atom isotope proportion, thereby realizing accurate measurement of the rubidium atom gas chamber gas isotope proportion. Compared with a conventional method, the device and the method have the advantages of accuracy, rapidness, simplicity and lower cost, and the closed air chamber structure does not need to be damaged.

The application discloses a kind of double-beam LAAS isotopic ratio high-precision fast measuring device and method, the device includes: second light splitting piece is used to first tunable laser light, after splitting, a small part enters first photoelectric detector, most enters first polarized beam splitter prism;Third light splitting piece is used to second tunable laser light after passing through second reflector, after splitting, a small part enters second photoelectric detector, most enters first polarized beam splitter prism;First photoelectric detector and second photoelectric detector are used to measure the intensity of first tunable laser light and second tunable laser light entering it respectively;Third photoelectric detector and fourth photoelectric detector are used to measure the intensity of first tunable laser light and second tunable laser light entering it respectively.The application greatly improves isotopic ratio measurement precision, and without laser wavelength scanning, without calibration, it can realize fast direct measurement to isotopic ratio.

The invention relates to a method for identifying and quantifying a nitrogen conversion path of an iron-enhanced anaerobic ammonia oxidation system by utilizing a 15N isotope labeling technology. According to the method, different 15N isotope substrate labeling schemes are designed, and the gas chromatography-isotope ratio mass spectrometry technology is combined, so that the composition difference of N2 isotopes generated in each denitrification path is accurately determined. Based on the generation rule and abundance ratio of 29N2 / 30N2, the contribution of Anammox, Feammox and NDFO to NH4 < + >-N oxidation and NOx <->-N reduction is quantitatively analyzed. The method can effectively reveal the activity change, individual contribution and synergistic action mechanism of each denitrification pathway in an iron-mediated complex reaction network, and provides powerful support for optimizing an iron-enhanced anaerobic ammonia oxidation system.

The invention relates to the technical field of silkworm cocoon producing area traceability, and discloses a silkworm cocoon producing area traceability model construction method based on hydrogen and oxygen stable isotopes, comprising the following steps: step 1, collecting silkworm cocoon samples of each producing area, degumming, and drying; step 2, performing plasma activation; step 3, generating H2 through a high-temperature pyrolysis reaction, and calculating an isotope ratio delta2H; 4, O2 is generated through a laser fluorination reaction, and the isotope ratio delta < 18 > O is calculated; 5, respectively establishing Fisher's discriminant classification functions of all producing areas; 6, a Fisher's discriminant classification function is built again through principal component values obtained through principal component analysis, and the silkworm cocoon sample producing areas are discriminated and classified through the discriminant function.The H and O stable isotope fingerprints are used for building the discriminant model, the discriminant model is more efficient, a faster discriminant method is provided for detection, the detection precision is high, and reproducibility is good.

Methods and systems for determining an estimated reservoir property using a determined desorption stage are disclosed. The method includes determining a fluid property and composition of a first fluid sample obtained from a reservoir, determining a measured relative volume of gas components and isotope ratios of gas components of the sample, and determining an equation of state. The method also includes obtaining a second and third sample at two later times, determining a composition, a measured relative volume of gas components, and isotope ratios of gas components of the later samples, and calibrating the equation of state utilizing the fluid composition and measured relative volume of gas components. The method further includes predicting a relative volume of gas components from the equation of state, determining a desorption stage, determining a critical pressure, an extent of desorption and a quantity of produced desorbed gas and determining the estimated reservoir property.

The invention relates to the technical field of silkworm cocoon identification methods, and discloses a method for identifying fresh cocoons and dried cocoons based on a stable isotope technology, and the method comprises the following steps: 1) carrying out decontamination treatment on the surfaces of a collected fresh cocoon sample and a collected dried cocoon sample; 2) pre-drying the fresh cocoon sample and the dried cocoon sample, and placing the dried samples in a standard atmospheric environment for moisture absorption balance; 3) crushing the fresh cocoon sample and the dried cocoon sample which reach the moisture absorption balance into fine particles for detection; and 4) measuring the isotope ratio of hydrogen and oxygen in the sample by using an isotope ratio mass spectrometer, and calculating a delta value according to a calculation formula: delta = (R sample / R standard-1) * 1000. The method is non-destructive, can effectively avoid subjective factors and errors in a traditional identification method, and can be widely applied to identification of fresh cocoons and dried cocoons in the silk industry.

This invention discloses an isotope tracing monitoring device and method for flue gas thermal fracturing-displacement-sealage, belonging to the field of isotope tracing technology. It includes multiple combined extraction and monitoring wells and multiple L-shaped injection wells. The vertical portion of each injection well and the combined extraction and monitoring wells penetrate the rock strata from top to bottom and extend into the coal seam, while the horizontal portion of the injection wells is within the coal seam. This invention utilizes separate injection... 13 CO2, 15 NO2 34 SO2, acting as a "fingerprint marker," combined with online isotope ratio analysis, enables independent, in-situ, and simultaneous tracking of key pollutant components in flue gas. Based on an isotope mass balance model, the real-time retention rate and cumulative sequestration amount of CO2, SO2, and NO2 can be calculated separately and quantitatively. This overcomes the limitations of traditional technologies that can only assess the overall sequestration effect, providing a revolutionary means for accurately assessing the sequestration safety and environmental risks of different pollutants.

The invention discloses a volcanic rock reservoir hydrothermal activity age determination method, and relates to the technical field of volcanic rock identification. Comprising the following steps: acquiring a zircon sample target of a volcanic reservoir to be detected; carrying out laser Raman spectrum test to obtain zircon sample target Raman spectrum data; processing the data to obtain the peak position and the full width at half maximum of the vibration peak v3SiO4 of the zircon sample target; fitting the full width at half maximum of the vibration peak v3SiO4 and the position parameters of the center of the wave crest so as to determine the morphological characteristics and components of the inclusions in the zircon; performing isotope proportion and trace element composition analysis to determine the formation age of zircon; and constructing a full width at half maximum-time fitting curve, and judging the formation period of the hydrothermal mineral symbiotic with the zircon. The method not only can be used for dividing the zircon period in volcanic lava, but also can be used for better judging the formation cause of the zircon, and provides an important judgment basis for the volcanic reservoir suffered from the later hydrothermal / tectonic action event and the time of the later hydrothermal / tectonic action event.

A determination method determines whether target molecules containing elemental hydrogen are electrolytic hydrogen-containing molecules, including hydrogen molecules produced by water electrolysis; or molecules produced using the hydrogen molecules as raw material. In the determination method, the method comprises determining whether the target molecules are the electrolytic hydrogen-containing molecules when an isotopic ratio of deuterium to light hydrogen in the target molecules is less than or equal to a predetermined threshold value, which is smaller than an isotopic ratio of deuterium to light hydrogen in nature.

The invention discloses an evaluation method for tracing main emission sources of atmospheric particulates and effectiveness of intervention measures. The evaluation method comprises the following steps: 1, constructing isotope ratio big data of different components or elements of the atmospheric particulates and the emission sources of the different components or elements; 2, analyzing isotope ratio characteristics of different emission sources of target components or elements in the atmospheric particulates; 3, performing time sequence trend analysis on the target component or element isotope ratio of the atmospheric particulates; and step 4, analyzing the change trend of the isotope ratio of the target component or element of the atmospheric particulates according to the isotope ratio fingerprint characteristics of the emission source, identifying the main emission source of a certain component or element in the atmospheric particulates in a specific time period, and evaluating the effectiveness of the intervention measure according to the continuous change rate of the isotope ratio characteristics. According to the invention, the analysis of a main emission source of a certain component or element in the atmospheric particulates is realized by carrying out continuous time sequence analysis on the isotope ratio characteristics of the atmospheric particulates.

This invention discloses a method for determining the phosphate oxygen isotopes of a single dentomorph based on ion chromatography-electrostatic orbital trap mass spectrometry, belonging to the field of isotope geochemical analysis technology. The method includes: acid digestion step; lyophilization step; reconstitution step; ion chromatography separation and fraction collection step; mass spectrometry analysis step: acquiring the mass spectrometric signals of the target fragment ions; isotope ratio calculation step: calculating the oxygen isotope shift of the sample relative to the reference solution; and calibration step: establishing a calibration curve using multiple known phosphate reference materials to obtain the phosphate oxygen isotope composition of the sample. This invention simultaneously solves three technical bottlenecks in existing thermal conversion elemental analysis-isotope ratio mass spectrometry methods: high sample consumption and cumbersome procedures prone to fractionation; secondary ion mass spectrometry methods: mixed signals and inability to distinguish different oxygen-containing components; and pure solution electrostatic orbital trap mass spectrometry methods: lack of solid sample pretreatment support.

The invention discloses a method for tracing the origin of mutton based on isotope ratio analysis. The method takes a standard mutton sample of known origin, adopts freeze-drying and grinding treatment, and measures the carbon, nitrogen and strontium isotope ratios and the contents of trace elements such as strontium, iron, zinc, selenium and calcium in the sample; three key ratio indices are established according to the measurement results: the ratio of carbon isotope to iron / zinc, the ratio of nitrogen isotope to selenium / calcium, and the ratio of strontium isotope to strontium content, to obtain a ratio characteristic vector of the standard sample; after the sample to be tested is subjected to the same treatment and analysis, the standardized Euclidean distance of the ratio characteristic vector is calculated to determine whether it has the same origin as the standard sample; the method of the invention combines isotope and trace element indicators, overcomes the defect of limited discrimination of a single indicator, and provides a new technical solution for tracing the origin of agricultural and sideline products.

The invention provides a dating method of indissolvable mineral fluorite, which is characterized in that boric acid and hydrochloric acid are directly used for digesting a natural fluorite sample, the content of Sm and Nd in the natural fluorite sample and the isotope ratio of 143Nd / 144Nd are measured, and then the age of the fluorite sample is determined. A natural fluorite sample of a Bayan Obo rare earth deposit in Inner Mongolia is selected, the selected fluorite particles are digested, separated and measured by the method, and the obtained age is consistent with the total rock data in an error range, so that the fluorite dating method disclosed by the invention is proved to be simple to operate, relatively low in cost, relatively high in precision and reliable in result; popularization and application are facilitated.

A pharmaceutical composition is used for improving health, curing abnormalities and degenerative diseases, and achieving anti-aging therapeutic effect in mammals. The pharmaceutical composition includes a pharmaceutical carrier and an isotope selective component including at least one of a chemical element in which the isotopic ratio of at least one light isotope is altered to exceed natural abundance.

The present disclosure relates to a method, including: collecting at least one water sample from a subterranean formation; obtaining a first normalized oxygen isotopic ratio based on a first water sample of the at least one water sample; obtaining a first normalized hydrogen isotopic ratio based on the first water sample; obtaining a first unknown water profile based on the first water sample, wherein the first unknown water profile comprises the first normalized oxygen isotopic ratio and the first normalized hydrogen isotopic ratio; comparing the first unknown water profile to at least one known water profile; and optimizing a hydrocarbon well, wherein optimizing a hydrocarbon well is based on comparing the first unknown water profile to at least one known water profile.