离子色谱法测定高盐卤水中铷、铯离子  

Simultaneous Determination of Rubidium and Cesium Ions in Brines by Ion Chromatography

作　　者：李娜 樊燕飞 李欣倩 高丹丹[1,4] LI Na;FAN Yan-fei;LI Xin-qian;GAO Dan-dan(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China;College of Chemistry and Chemical Engineering,Central South University,Changsha,410083,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining,810008,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]中国科学院大学,北京100049 [3]中南大学,湖南长沙410083 [4]青海盐湖资源综合利用技术研究开发中心,青海西宁810008

出　　处：《盐湖研究》2023年第3期69-77,共9页Journal of Salt Lake Research

基　　金：青海省应用基础研究(2021-ZJ-747);国家自然科学基金(U1707602,U1407131)。

摘　　要：铷、铯及其化合物是重要的先进能源材料。我国盐湖和深部卤水中蕴藏丰富的铷、铯资源。铷、铯离子含量的准确快速测定对于其资源开发具有重要意义。本研究建立了离子色谱法测定高盐卤水中Rb^(+)、Cs^(+)离子的方法。选用Metrosep C6-150柱(150 mm×4 mm)为分离柱,以5 mmol·L^(-1)羟基乙叉二膦酸(HEDP)和15%乙腈的混和溶液为流动相,流速0.9 mL·min^(-1),柱温35℃,进样量20μL,卤水样品中Rb^(+)、Cs^(+)离子与Li+、Na+、K+、Mg^(2+)、Ca^(2+)、Sr^(2+)等常见共存离子在8 min内有效分离。Rb^(+)、Cs^(+)质量浓度在1~500 mg·L^(-1)范围内,相关系数均大于0.999 9,方法检出限为0.19 mg·L^(-1)和0.36 mg·L^(-1),定量限分别为0.62 mg·L^(-1)和1.21 mg·L^(-1),加标回收率为99.43%~102.03%。本方法样品处理简便、准确度高、线性范围宽,适用于卤水中微量和常量铷、铯离子的快速准确测定。Rubidium,cesium and their compounds are important advanced energy materials.There are abun⁃dant rubidium and cesium resources in salt lakes and deep brines in China.Accurate and rapid determination of rubidium and cesium ion content is of great significance for its development.In this study,a method for the determination of Rb^(+)and Cs^(+)in brines by ion chromatography was established using Metrosep C6-150 cation chromatographic column with elution by a mixed solution of 5 mmol·L^(-1) hydroxyethylidenediphosphonic acid(HEDP)and 15%acetonitrile.Afterwards,Rb^(+)and Cs^(+)ions in brine samples were effectively separated from common coexisting ions such as Li+,Na+,K+,Mg^(2+),Ca^(2+)and Sr^(2+)within 8 mins,and their amounts of rubidium and cesium were determined using an electrical conductivity detector.The correlation coefficients for rubidium and cesium ions were more than 0.9999 in the range of 1~500 mg·L^(-1),with the detection limits of 0.19 mg·L^(-1) and 0.36 mg·L^(-1),respectively.The relative standard deviations of the determination results were 0.62 mg·L^(-1) and 1.21 mg·L^(-1),and the recoveries were 99.43%~102.03%and RSDs were less than 2%.The method has a simple sample pretreatment procedure and simple and a wide linear range,which meets the requirements for the determination of rubidium and cesium ions in brines.

关 键 词：离子色谱法 铷 铯 卤水 

分 类 号：O657.7[理学—分析化学]