钡存在下铅的测定

Determination of Lead in the Presence of Barium

介绍了当含铅物料中w(钡)>2%时,在常规配位滴定法测定铅的基础上,采用浓硫酸高温强热处理物料,使铅、钡成为Pb(HSO4)2与Ba(HSO4)2而溶解,用水稀释后得到松散的PbSO4与BaSO4,使HAc-NaAc的抽取率大大提高,当m(Pb):m(Ba)=3:1甚至2:1时,得到满意的测定结果。

When the barium content in containing lead materials was more than 2%,in the regular coordinate titration of lead,through high temperature and strong heat treatment of materials with concentrated sulfuric acid,lead and barium were transformed into Pb （HSO4）2 and Ba （HSO4）2,then loose PbSO4 with BaSO4 were gained after dilution with water,which increased extraction rate of HAc-NaAc greatly.When the Pb：Ba was 3：1 or 2：1,determination results was satisfactory.