阳离子交换树脂分离电感耦合等离子体质谱法测定空气颗粒物中铂族元素

Determination of Platinum Group Elements in Airborne Particulate Matter by Inductively Coupled Plasma-Mass Spectrometry with Cation Exchange Resin

用Dowex AG50W-X8阳离子交换树脂分离空气颗粒物中Pt、Pd、Rh测定的干扰元素Cu、Ga、Hf、Pb、Rb、Sr、Y。模拟标准液实验确定出Dowex AG50W-X8阳离子交换树脂分离流程的最佳条件:上柱HCl浓度为0.8mol/L,树脂柱床高为4cm,洗脱速率为1mL/min。铂族元素分析的国际标准物质BCR-723对照分析表明,Pt、Pd、Rh的测定值与标准值吻合,干扰元素Cu、Ga、Pb、Rb、Sr、Y的分离效率均大于94%,这表明所建立的Dowex 50W-X8阳离子交换树脂分离流程是可靠的。

Dowex AG50W-X8 cation exchange resin was used for the separation of interference elements Cu, Ga, Hf, Pb, Rb, St, Y in airborne particulate matter in the determination of Pt, Pd and Rh by ICP-MS. Optimal experimental conditions for the cation exchange procedure were examined by simulant sample solutions. The concentration of HC1 in sample solution was 0.8 mol/L. The length of cation exchange column was 4 cm. The elution rate of the cation exchange column was 1 mL/min. An international standard material, BCR-723, for the determination of Pt, Pd and Rh was sued to evaluate the reliability of the cation exchange procedure. The analytical results of BCR-723 showed that the determination values of Pt, Pd and Rh were in good agreement with those standard values, and the removes of interference elements Cu, Ga, Pb, Rb, Sr and Y were over 94%. This indicated that the Dowex AG50W-X8 cation exchange procedure was reliable.