电感耦合等离子体质谱法测定汽车尾气净化催化剂中铂、钯、铑含量

ICP-MS Determination of Pt, Pd and Rh in Catalysts for Auto-exhaust-gas Purifier

摘要: 汽车尾气净化催化剂样品经过氧化钠熔融,用热水浸出,加入盐酸酸化后,分取部分试液用电感耦合等离子体质谱法测定其中铂、钯、铑的含量。选择镉(111Cd)和铊(203Tl)作为内标元素。铂、钯、铑的检出限(3s)分别为0.048,0.056,0.019 μg·g-1。方法用于5件催化剂样品的分析,测定结果与光度法测定结果相一致。铂、钯、铑的平均回收率分别为100.0%,100.0%,99.8%;相对标准偏差(n=12)分别为1.3%,1.0%,1.6%。

Abstract: Sample of catalysts for auto-exhaust-gas purifier was fused with Na2O2, and the melt was dissolved in hot water and acidified with HCl. An aliquot of the sample solution was taken for ICP-MS determination of Pt, Pd and Rh. 111Cd and 203Tl were used as internal standards. Values of detection limit (3s) of Pt, Pd and Rh found were 0.048, 0.056, 0.019 μg·g-1 respectively. The proposed method was used in the analysis of 5 catalyst samples, the results obtained were in conformity with those obtained by photometry. Values of recovery and RSD′s (n=12) found were 100.0% and 1.3% for Pt, 100.0% and 1.0% for Pd, 99.8% and 1.6% for Rh respectively.