氢化物发生-原子荧光法直接测定锑及其化合物中的铅

Direct Determination of Lead in Antimony and Antimony Compounds by HG-AFS

通过在样品处理阶段用HBr除去大量锑基体 ,实现了不需再通过其他化学分离直接运用氢化物发生 -原子荧光法测定锑及其相关产品中的微量铅 ,并用于实际样品的分析。该方法对样品检测下限小于 1 0 - 6,在实际样品分析中 ,分析结果与原子吸收法测定结果之间无显著性差异 ,RSD <2 .0 % (n =4) ,对样品分析的加标回收率在 95 %～ 1 0 5 %。

In this paper a sensitive and rapid method for the determination of lead in antimony and antimony compounds by HG AFS is developed. The matrix of antimony is vaporized with hydrobromic acid during sample pre treatment. The detection limit of this method for lead is less than 1×10 -6 . The precision for the samples with w (Pb)=0.045×10 -2 is better than 2.0% RSD ( n =4). The recovery of the method is 95%～105%. The method has been applied to the determination of trace lead in antimony and antimony products. The analytical results are in agreement with those from AAS analysis.