盐湖卤水中锂的高效分离及其同位素比值的精确测定进展

锂的两个稳定同位素相对质量差较大,导致了自然界中的锂同位素分馏强烈。卤水中锂同位素作为良好示踪剂,可用以指示盐湖锂矿床的物质来源和形成机理。现阶段一般用热电离质谱法(TIMS)或多接收器电感耦合等离子质谱法(MC-ICP-MS)测量锂同位素比值,这两种方法都需要将锂从样品中与其它元素完全分离。在现有的卤水提锂方法中,吸附法能够得到较高的锂回收率,减少了锂同位素在提取过程中的分馏效应。本文主要介绍国内外近年来在提取锂和准确测定锂同位素比值方面所取得的进展。

Efficient Separation and Accurate Isotopic Determination of Lithium in Brine

The significant relative mass difference between the two stable isotopes of lithium makes a great lithium isotopic fractionation in nature materials.Lithium isotopes,as a tracer,have been used to indicate the material source and formation mechanism of lithium deposit.At present,the lithium isotope ratio was measured by thermal ionization mass spectrometry(TIMS) or the multiple collector inductively coupled plasma mass spectrometry(MC-ICP-MS).Both methods require the lithium completely separated from other elements.The adsorption method,in all the lithium extractive technique,could produce higher recovery rate and minimize isotopic fractionation.This paper mainly introduced the progress of the separation and accurate isotopic determination of lithium in brine at home and abroad in recent years.