水溶液中溶质的扩散同位素分馏研究

稳定同位素分析是判定水溶液中溶质的组成、来源、迁移和转化过程与规律的重要工具,在自由扩散等物理化学作用下,对溶质的同位素分馏研究是稳定同位素技术应用的重要基础.本研究介绍了溶质的扩散过程与其同位素分馏效应之间的联系,论述了研究溶质扩散过程中引入的稳定同位素分馏现象的意义,描述了水溶液中溶质扩散的不同模拟实验方法及相关研...

Diffusion-induced isotope fractionation of solutes in aqueous solution

Stable isotope analysis is a valuable tool for characterizing the composition,origin,transport,and transformation processes of different solutes in aqueous solutions.Understanding various physical and chemical processes,such as diffusion-induced isotope fractionation,is instrumental for the analysis and applications of stable isotopes.Our study demonstrates the fundamental theory of diffusion-induced isotope fractionation.Different experimental protocols for diffusion simulation experiments are summarized,and the corresponding experimental results,including solutes diffusion coefficients and their mass dependence coefficients,are discussed in detail.Moreover,the interpretation of diffusive isotope fractionation for different target solutes is illustrated based on the hydration-shell theory as well as on the results obtained from molecular dynamic simulation(MDS)studies.Finally,an outlook for future research on diffusive isotope fractionation is presented.