High purity silver nitrate for determining isotopic composition in natural waters and methods and applications thereof

By using BaCl2 and cation and anion exchange resins to prepare high-purity silver nitrate, the problems of high cost and isotope fractionation in existing technologies have been solved, enabling high-precision determination of nitrate nitrogen and oxygen isotopes, reducing experimental costs and improving measurement accuracy.

CN122448604APending Publication Date: 2026-07-24SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2026-05-13
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing methods for determining nitrate nitrogen and oxygen isotopes in natural water bodies suffer from high costs, isotope fractionation, and exchange problems caused by acidic eluents, making it difficult to effectively reduce experimental costs and improve measurement accuracy.

Method used

Using BaCl2 as the anion exchange eluent, combined with anion and cation exchange resins, and by pretreating Ag2O powder, Cl-type anion exchange resin and H-type cation exchange resin, the use of acidic eluent was reduced, and high-purity silver nitrate was prepared for the determination of isotopic composition in natural water bodies.

Benefits of technology

It significantly reduced experimental costs, decreased isotope fractionation, improved the precision and accuracy of nitrogen and oxygen isotope determination, reduced the content of interfering ions, and enabled rapid determination of nitrate δ15N and δ18O isotopes.

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Abstract

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.
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