4 results about "Isotopic composition" patented technology

The present application belongs to the technical field of geochemistry, and particularly relates to the estimation of the carbon flux of the earth system, and especially relates to a method and system for estimating the carbon flux of the deep-time earth system. The method for estimating the carbon flux of the deep-time earth system provided by the present application solves the four defects in the traditional technology caused by the fixed carbon pool assumption, the neglect of the atmospheric / biosphere carbon content, the isotopic error, and the failure to consider the fractionation effect through dynamic carbon pool segmentation, the inclusion of multi-sphere isotopic composition, and the correction of fractionation effect. The high-precision and verifiable model framework not only improves the scientificity of the deep-time carbon cycle research, but also provides a key tool for analyzing the climate evolution mechanism in the geological history period and predicting the future climate change trend, and has important theoretical innovation and practical application value.

The application discloses high-purity silver nitrate for determining isotopic composition in natural water bodies and a method and application thereof, and belongs to the technical field of oxygen and nitrogen isotope determination. The method comprises the following steps: pretreating Ag2O powder, Cl type anion resin and H type cation resin respectively to obtain pretreated Ag2O powder, Cl type anion resin and H type cation resin; enriching a natural water sample containing interfering ions by using the pretreated Cl type anion resin, then eluting the sample by using a BaCl2 solution to obtain an eluent A; ensuring complete exchange of the eluent by using the pretreated H type cation resin, and then collecting the obtained eluent B again; and putting the pretreated Ag2O powder into the obtained eluent B for neutralization treatment, and then performing centrifugation and freeze-drying to obtain high-purity silver nitrate. The technical problems that the existing method is difficult to reduce cost and causes isotopic exchange caused by an acidic eluent are solved.

This invention relates to the field of plant water source ratio calculation technology, and discloses a normalized method for calculating the plant water source ratio, comprising the following steps: S1, data acquisition, determining the isotopic composition of xylem water and soil water in each layer through stable water isotope analysis; S2, contribution ratio calculation, calculating the contribution ratio of each soil layer to plant water; S3, water source score calculation, calculating the water source score WSS according to the formula; S4, evaluation and application, constructing the relationship with ecosystem variables through the WSS score. By normalizing the water source score WSS value from 0 to 1, and eliminating absolute depth differences through mathematical standardization, the research results of different regions or different soil stratification schemes are directly comparable, thereby solving the defect of traditional methods that cannot be compared horizontally due to the subjectivity of depth boundaries, and realizing an objective comparison of the degree of plant deep water dependence across regions.

This invention belongs to the field of isotope geochronology, specifically relating to a laser ablation fractionation method and system for analyzing the U-Pb age, trace elements, and Hf isotopes of zircon. This invention employs wet plasma technology to improve the uranium detection sensitivity of Q-ICP-MS and ensure the consistency of thorium / uranium fractionation behavior, reducing the difficulty of Q-ICP-MS setup. A gas path connection design with different inner diameters replaces the micro diaphragm pump, achieving stable transmission of unequal amounts of aerosol to two mass spectrometers, reducing experimental costs and improving instrument setup efficiency. The acquired data is converted into a time series, and a multi-external standard correction scheme is used to achieve automated and accurate LASS analysis. This invention utilizes LASS technology to conveniently and accurately determine the U-Pb geochronology, trace element, and Hf isotopic composition of zircon simultaneously, which is beneficial for expanding the application of zircon in geological research.