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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Determination of platinum group elements (PGE) in environmental samples by ICP-MS: a critical assessment of matrix separation for the mitigation of interferences
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Determination of platinum group elements (PGE) in environmental samples by ICP-MS: a critical assessment of matrix separation for the mitigation of interferences

机译：通过ICP-MS测定环境样品中的铂族元素（PGE）：对降低干扰的基质分离的关键评估

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摘要

The accurate determination of Pt, Pd and Rh (platinum group elements, PGE) in environmental samples by inductively coupled plasma–mass spectrometry (ICP-MS) is complicated by molecular ion and doubly charged ion interferences (e.g. CuAr+, HfO+, SrO+, YO+ and Pb2+). Two matrix separation techniques, tellurium coprecipitation and ion exchange, are compared in terms of PGE recovery and separation efficiency by application to standard solutions and the new reference material BCR-723, a road dust material collected from the Tanzenberg Tunnel in Austria. Ion exchange using Dowex AG50W-X8 strong cation exchange resin is highly effective in terms of both separation efficiency (>99.7%) and PGE recovery (93.8 to 101.6%) and allows accurate, interference-free determination of PGEs. PGE recoveries by Te coprecipitation are incomplete, ranging between 84 and 93%. Significant amounts of copper (up to c. 30%) are also recovered, which, due to CuAr+ formation, causes interferences on both 103Rh (monoisotopic) and 105Pd. The generally high levels of interferent elements in environmental matrices (e.g. Cu, Pb etc.) and the magnitude of Cu recovery by Te coprecipitation limit the applicability of data correction using interference equations. Reductions in Cu yield by Te coprecipitation, to <4%, can be achieved through the addition of potassium iodide prior to matrix separation. However, due to the incomplete recovery of PGEs, ion exchange provides a more robust method for the determination of low levels of PGEs.
机译：电感耦合等离子体质谱法（ICP-MS）准确测定环境样品中的Pt，Pd和Rh（铂族元素） sup> 离子和双电荷离子干扰（例如CuAr +，HfO +， SrO +，YO +和Pb2 +）。通过应用在标准 溶液和新的溶液中，比较了碲 共沉淀和离子交换这两种基质分离技术的PGE 回收率和分离效率。参考材料BCR-723，这是从奥地利坦赞贝格隧道收集的道路扬尘 材料。使用Dowex AG50W-X8强阳离子交换树脂进行离子 交换在分离效率（> 99.7％） 和PGE回收率方面均非常有效（ 93.8至101.6％），并且可以准确，无干扰地确定PGE。 Te共沉淀 回收的PGE不完全，介于84％和93％之间。还回收了大量的 铜（最多约30％），由于形成了CuAr + ，这对两个< sup> 103 Rh（同位素） 和 105 Pd。环境基质（例如，Cu，Pb等）中干扰元素 的水平普遍较高，并且Te共沉淀回收Cu的幅度 限制了其适用性。 >使用干扰方程进行数据校正。通过在基质分离之前添加碘化钾，可以使Te共沉淀将Cu的产量降低到<4％， 。 由于PGE的回收不完全，离子交换 为测定PGE的低含量 提供了更可靠的方法。

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