等离子体质谱法快速测定地质样品中的痕量铂族元素和金  

Fast Determination of Platinum Group Elements and Gold in Geological Samples by ICP MS

作　　者：漆亮[1] 胡静[1] 

机构地区：[1]中国科学院贵阳地球化学研究所矿床地球化学开放实验室,贵阳550002

出　　处：《岩矿测试》1999年第4期267-270,共4页Rock and Mineral Analysis

摘　　要：１ ～５ ｇ 试样于刚玉坩埚中经Ｎａ２ Ｏ２ 熔融分解，王水浸取后蒸发脱水除ＳｉＯ２ ，碲共沉淀富集铂族元素和金，用同位素稀释－ 等离子体质谱法测定Ｒｕ 、Ｐｄ 、Ｉｒ 和Ｐｔ，内标法测定Ｒｈ 和Ａｕ 。按取样５ ｇ 计算，方法的测定限小于０ ．３５ ｎｇ／ ｇ ，经ＣＣＲＭＰ（ Ｃａｎａｄｉａｎ ｃｅｒｔｉｆｉｅｄ ｒｅｆｅｒｅｎｃｅｍａｔｅｒｉａｌ ｐｒｏｊｅｃｔ）６ 个铂族元素标样分析验证，其结果与标准值基本吻合，５ 次平行测定的ＲＳＤ 在１ ．５ ％ ～６ ．５ ％ 。A method for fast determination of platinum group elements (PGEs) and gold in geological samples by inductively coupled plasma mass spectrometry was developed. 1～5 g sample was decomposed with Na 2O 2 in corundum crucible. After dissolving the fused disc with aqua regia and evaporating the solution to dryness for removing the SiO 2, PGEs were concentrated by Te co precipitation. Ru, Pd, Ir and Pt were determined by ID ICP MS. Rh and Au were determined by internal standard ICP MS. For 5 g sample, the detection limits for these elements are < 0.3 ng/g. The method has been applied to the determination of PGEs and gold in six CCRMP precious metal reference materials. The results are in agreement with the certified values with precision of 1.5%～6.5% RSD ( n =5).

关 键 词：铂族元素 等离子体质谱 金 地质样品 

分 类 号：P578.12[天文地球—矿物学] P578.11[天文地球—地质学]