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

范凡; 温宏利; 屈文俊; 曹亚萍

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

摘要

摘要: 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。

Abstract: 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.

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