多接收电感耦合等离子体质谱法高精密度测定汞同位素组成  

High Precision Determination of Mercury Isotope Ratios Using Online Mercury Vapor Generation System Coupled with Multi-collector Inductively Coupled Plasma-Mass Spectrometry

作　　者：尹润生[1,2] 冯新斌[1] Foucher Delphine 侍文芳[1,2] 赵志琦[1] 王静[1] 

机构地区：[1]中国科学院地球化学研究所,环境地球化学国家重点实验室,贵阳550002 [2]中国科学院研究生院,北京100039 [3]Department of Chemistry, Trent University, 1600 West Bank, Drive, Peterborough, Ontario, K9J 7B8, Canada

出　　处：《分析化学》2010年第7期929-934,共6页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.40825011)资助项目

摘　　要：采用多接收等离子体质谱(MC-ICP-MS)方法高精度测定了Hg同位素组成。本方法借助在线进样系统,最大程度上克服了同位素干扰和基体效应;采用同位素内标法和样品-标准交叉法以消除仪器自身的质量分馏;通过实验条件(如测定时间、进样量等)的优化,方法的内精度显著提高。研究表明:为保证汞同位素组成的高精度测定,汞最低进样浓度为2μg/L时,内精度<0.02‰(RSD)。运用本方法对汞标准NISTSRM3133和UM-Almadn实验室内标样长达7个月的测定,结果表明,本方法外精度<0.06‰(2SD)。此外,对一系列环境样品的同位素组成进行了测定,样品的外精度<0.10‰(2SD)。测定样品δ202Hg变化范围为-3.48‰～0.63‰,幅度达4.11‰。A method was developed for high precision measurement of Hg isotope ratios by multiple collector inductively coupled plasma mass spectrometry（MC-ICP-MS） using an on-line Hg reduction technique.The procedure was evaluated to get high precision measurements that were good enough to significantly detect the anticipated small differences in Hg isotope compositions in natural samples.Typically,internal precision was better than 0.02‰ （1 Relative standard error,RSE） on all Hg ratios investigated.The external reproduci-bility for standard N IST SRM3133 and UM-Almadén secondary solution,nature samples were 0.06‰ （2SD） and 0.10‰ （2SD） over the course of 7 months,respectively.The extent of fractionation has been investi-gated in a series of natural samples from different locations in China.The ratio 202/198Hg expressed as δ values （per mil deviations relative to NIST SRM 3133 Hg standard solution） was from-3.48‰ to 0.633‰.

关 键 词：汞 同位素比值 多接受杯电感耦合等离子体质谱 

分 类 号：O657.63[理学—分析化学]