摘要
近年来有关锂同位素的研究及其应用已成为水环境领域研究的热点问题之一。锂的两个稳定同位素(~6 Li和~7 Li)之间相对质量差较大,容易产生明显的同位素分馏,研究表明温度是控制锂同位素分馏的关键因素,扩散驱动以及配位数差异也会对锂同位素分馏产生重大影响。自然界中锂同位素的组成变化很大,δ7 Li值在-40‰^+50‰之间变动,不同地质体的δ7 Li值的明显差异使锂同位素的应用范围更加广泛。锂元素较高的化学活动性决定了它能够积极地参与各种水环境演化过程,并被作为新的示踪工具应用于环境水体污染、水循环以及卤水形成与演化等领域。概述了锂同位素作为良好的示踪工具在水环境领域取得的最新研究成果,以期为拓展锂同位素在环境地质方面的应用研究提供借鉴。
Recently research on Lithium（Li）and its application has become one of the most promising topics in the water ervironmental research fields.Li has two stable isotopes with mass of 6and 7,respectively.The relative mass difference between these two isotopes is considerable at 17%,resulting in a significant mass-dependant fractionation during geochemical processes.Temperature is the key factor that leads to the Li isotopic fractionation.Besides,diffusion-driven fractionation and the differences among coordination numbers also influence Li isotopic fractionation.The compositions of Li isotopes in nature show considerable variation,δ~7Li varying from-40‰ to ＋50‰ which contributes to its wide application.The different lithium-isotope compositions of different geological materials make lithium-isotope a widely used tracer.The high chemical activity of Li not only promotes its participation in the evolution process of water environment,but also makes it a good tool in tracing water pollution,water recycling processes and the origin and evolution of brines.The main purpose of this paper is to synthetically summarize current development of Li isotope as a tracer in the water environment,and to provide reference for extending the research of Lithium isotopes application in environmental geology.
出处
《安全与环境工程》
CAS
2016年第3期1-9,16,共10页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41372251)
湖北省自然科学基金项目(2013CFB440)
关键词
锂同位素
分馏
水环境
示踪
Lithium isotopes
fractionation
water environment
tracer
