石墨炉原子吸收光谱法测定地质样品中的痕量铂、钯

THE DETERMINATION OF TRACE PLATINUM AND PALLADIUM IN GEOLOGICAL SAMPLES BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY

本文提出了用717阴离子交换树脂富集铂、钯的石墨炉原子吸收光谱分析方法。对富集铂、钯的条件,共存离子的干扰情况以及在GF-2000型石墨炉中测定铂、钯的最佳条件进行了研究。样品用王水分解后,在10％的王水介质中,用717阴离子交换树脂富集铂、钯,以热的硫脲溶液解脱,在拟定的工作条件下,于石墨炉原子吸收光谱仪上进行测定,大量的共存离子不干扰测定。方法简便快速,检出限分别为Pt8.8×10^(-9)g/ml,Pd3.4×10^(-9)g/ml,方法的相对标准偏差分别为Pt7.09％Pd11.48％,适用于地质样品中铂、钯的测定,结果令人满意。

A method for the determination of trace platinum and palladium using 717 anion exchange resin for separation and enrichment——graphite furnace atomic absorption spectrometry is described. Preconcentration condition of platinum and palladium,interferences from the co-existing ions and optimum condition for the determination of platinum and palladium by GF-2000 graphite furnace are studied. In 10% aqua regia medium,platinum and palladium are sorbed on a 717 anion exchange resin column,meanwhile large quantities of co-existing ions are not sorbed. After eluted by hot thiourea solution,they are determined with GFAAS. The detection limits and relative standard deviations are 8.8×10^(-9)g/ml,7.09% for platinum and 3.4×10^(-9)g/ml, 11.48％00 for palladium,respectively. This method is simple and rapid. Some samples have been determined with satisfactory results using the methodh