有机螯合沉淀剂富集－感耦等离子体质谱法测定地球化学样品中痕量元素

Preconcentration with Chelating precipitant APDC for the Determination of Trace Elements in Geochemical Samples by Icp-MS

报道了用吡咯烷二硫代氨基甲酸铵（ＡＰＤＣ）有机螯合沉淀剂沉淀富集后，等离子体质谱法测定地球化学样品中２６个痕量元素的方法。研究了ＡＰＤＣ定量沉淀待测金属离子的条件，分别在ｐＨ２和ｐＨ７时使２６个元素富集，回收率在９４％～１０５％；样品测定下限为０．０１～０．４μｇ／ｇ；方法的ＲＳＤ（ｎ＝１０）为３％～１３％。经几种地球化学标准物质验证，结果与推荐值相符。

s many as 26 trace elements including the 15 rare earth elements,Sc,Th,Be,In,T1,Cd,Bi,Co,Ni,Cu and Pb are preconcentrated by precipitation with pyrrolidinedithiocarbamateat pH 2 and pH 7 respectively and determined by ICP-MS using Rh as internal standard.The detection limits were 0.03～0.9ng/ml and the recoveries obtained by standard additions were94%～105%。The presented method has been applied to the analysis of geochemical referencestandard samples with satisfactory results.