水溶液中溶质的扩散同位素分馏研究  

Diffusion-induced isotope fractionation of solutes in aqueous solution

作　　者：张霁云 金彪 张干[1,2] ZHANG Jiyun;JIN Biao;ZHANG Gan(State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;CAS Center for Excellence in Deep Earth Science,Guangzhou 510640,Guagndong,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640 [2]中国科学院深地科学卓越创新中心,广东广州510640 [3]中国科学院大学,北京100049

出　　处：《地球化学》2022年第1期1-8,共8页Geochimica

基　　金：国家自然科学基金项目(41903065);中国科学院地球科学领域核心关键技术攻关预研项目(282021000003)联合资助。

摘　　要：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究进展,总结分析了包括扩散系数、质量相关性等因素的影响,并介绍了基于水膜理论和分子动力学模型模拟阐释溶质扩散同位素分馏机理的相关研究成果,对今后的研究趋势和主要任务进行了展望。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.

关 键 词：水溶液 扩散 同位素分馏 

分 类 号：X142[环境科学与工程—环境科学]