铅锡合金中锡和铅的连续示波滴定

Oscillographic titration of lead and tin in pewter

报道了铅锡合金中铅、锡含量的连续示波测定方法 ,选择在pH 5 .5的缓冲介质中 ,以NH4F释放Sn EDTA中的EDTA和 (NH4) 2 MoO4释放Pb EDTA中的EDTA ,采用Zn2 +标准溶液滴定。方法快速简便 ,终点直观 ,标准加入回收率在99.5 %～ 1 0 0 .5 %之间 ,RSD <0 .5 %

Oscillographic titration of Sn and Pb in pewter was described. In HAc NaAc buffers at pH 5.5, EDTA was added and complexed with Sn, Pd and other metal ions. The EDTA released from Sn EDTA by NH 4F, and from Pb EDTA by (NH 4) 2MoO 4 was titrated by standard Zn successively. The recovery rate was 99.5%～100 5% and RSD was less than 0.5%.