密闭消解-ICP-MS法测定地质样品中的痕量铑和铱  

Sealed Digestion and ICP-MS Determination of Trace Rh and Ir in Geological Samples

作　　者：张金矿[1] 于亚辉[1] 陈浩凤[1] 李小辉[1] 刘春霞[1] 王琳[1] ZHANG Jinkuang;YU Yahui;CHEN Haofeng;LI Xiaohui;LIU Chunxia;WANG Lin(Ministry of Land and Resources Key Laboratory of Precious Metals Analysis Technology, Henan Province Rock ＆ Mineral Testing Centre, Zhengzhou 450012, China)

机构地区：[1]河南省岩石矿物测试中心,国土资源部贵金属分析技术重点实验室,郑州450012

出　　处：《贵金属》2017年第4期56-60,65,共6页Precious Metals

基　　金：河南省“两权价款”地质科研项目(豫国土资发[2016]56号-4)

摘　　要：采用密闭消解的方法,以王水在200℃经16 h消解地质样品,用电感耦合等离子体质谱法(ICP-MS)直接测定Rh和Ir。以Lu为内标元素消除基体效应,建立校正方程消除Cu和Sr对Rh、Hf对Ir的所产生的多原子离子干扰,可在酸溶体系中不经分离富集直接测定铂族物料中的痕量Rh和Ir。结果表明,Rh和Ir的检出限分别为0.014 ng/g和0.012 ng/g,方法回收率为90%~111%,用于铂族元素地球化学一级标准物质中Rh、Ir的测定,所得结果与认定值一致,相对标准偏差(RSD)小于9.6%。The method of inductively coupled plasma mass spectrometry （ICP-MS） for the determination of Rh and Ir in geological samples was established by using sealed digestion technique in aqua regia at 200℃ for 16 hours. The matrix effect was eliminated by using Lu as the internal standard element, whereas the interference of Cu and Sr to Rh and Hf to Ir was eradicated via the establishment of the correction equation. Trace Rh and Ir in the platinum group was determined in acid-soluble system without separation and enrichment. The results showed that the detection limit was 0.014 ng/g for Rh and 0.012 ng/g for Ir, and the recovery was 90%-111%. When the method was applied to the determination of Rh and Ir in the primary chemical substance of the platinum group, the analysis results were in agreement with the determined values, and the relative standard deviations （RSD） were less than 9.6%.

关 键 词：分析化学 密闭消解 电感耦合等离子体质谱法(ICP-MS) 地质样品 铑 铱 

分 类 号：O652.4[理学—分析化学] O657.3[理学—化学]