王水溶样-等离子体质谱法同时测定地质样品中砷锑铋银镉铟

Determination of Arsenic, Antimony, Bismuth, Silver, Cadmium and Indium in Geological Samples by Inductively Coupled Plasma-Mass Spectrometry with Aqua Regia Sample Digestion

采用王水溶样-等离子体质谱法测定地质样品中砷、锑、铋、银、镉、铟6个元素，探讨了测定过程中对砷、银、镉、铟干扰的消除问题。方法检出限（10SD，μg/g）分别为：砷0．2、锑0．01、铋0．005、银0．01、镉0．01、铟0．005：精密度（RSD，n=12）分别为砷1．3％-3．0％、锑0．65％～2．3％、铋1．2％～2．6％、银3．2％～6．6％、镉3．7％。8．0％、铟1．1％～5．0％；加标回收率分别为砷96．8％～106％、锑102％～108％、铋102％-106％、银99．7％～104％、镉103％～108％、铟97．9％～100％。用拟定方法测定了国家一级标准物质中砷、锑、铋、银、镉、铟，结果与标准值相符。方法适用于岩石、土壤、水系沉积物等地质样品的测定。

This paper presents the method for determination of As, Sb, Bi, Ag, Cd and In in geological samples by inductively coupled plasma-mass spectrometry（ICP-MS） with aqua regia sample digestion. The elimination of the interference from coexistent elements on the determination of these elements was discussed. The detection limits （10SD, μg/g） are 0.2 for As, 0.01 for Sb, 0.005 for Bi, 0.01 for Ag, 0.01 for Cd and 0.005 for In. The recoveries are 96.8% -106% for As, 102% - 108% for Sb, 102% - 106% for Bi, 99.7% - 104% for Ag, 103% - 108% for Cd and 97.9% - 100% for In, with the precision （RSD,n = 12） of 1.3%- 3.0%, 0.65% -2.3%, 1.2% -2.6%, 3.2% -6.6%, 3.7% -8.0% and 1.1% -5.0% respectively. The method has been applied to the determination of these elements in the National Standard Reference Materials and the results are in agreement with the certified values.