敞口消解ICP-MS同时测定北京地区环境尘土样品中痕量铂、铑、钯的研究

研究了电感耦合等离子体质谱(ICP-MS)同时测定土样中痕量铂、铑、钯的分析方法。比较几种尘土样品的消解处理方法，采用王水加热回流来消解样品。优化了样品测量条件，并研究了干扰情况和消除干扰的方法。所建立的方法的精密度、线性关系良好，在优化的实验条件下Pt，Pd，Rh的检出限分别为0.48，4.22和0.42 ng·g-1,样品的加标回收率分别为Pt 87.6％～88％，Pd 85.2％～87.8％和Rh 93％～95％。将建立的方法应用于环境尘土样品的测定，回收率在85％以上，结果令人满意。

Simultaneous Determination of Trace Platinum, Palladium and Rhodium in Environmental Dust Samples by ICP-MS after Open-Digestion

A sensitive method for simultaneous determination of Pt, Pd and Rh in dust samples by ICP-MS after open-digestion was developed. The digestion method for the samples and conditions for measurement for ICP-MS were studied in detail. Aquaregia was proved to be a better solvent for the digestion of dust samples. Under the optimum conditions, the limits of detection of Pt, Pd and Rh were 0.48, 4.22 and 0.42 ng x g(-1), respectively. The proposed method was applied to the real sample analysis, and good recoveries were obtained. The recoveries of Pt, Pd and Rh were found to be between 87.6%-88%, 85.2%-87.8%, and 93%-95%, respectively.