摘要
报道了铅盐在弱酸性介质中以钨酸错形式沉淀钨（Ⅵ），使钙和镁与钨定量分离。过量铅及其它干扰元素用铜试剂消除，从而实现快速测定钙和镁的络合滴定。该法简便、快速，钨的分离效果甚佳，沉淀对钙和镁吸附小，方法准确度高。已用于白钨矿中钙和镁的连续测定，结果满意。
A simple, rapid and accurate complexometric determination of calcium and magnesium in the presence of tungsten is described. In weak acidic media, tungsten(Ⅵ ) was precipitated by lead nitrate, and was separated from the solution containing calcium(Ⅱ), magnesium(Ⅱ) and tungsten(Ⅵ ). The excess lead(Ⅱ) and other metal ions were eliminated by cupral. Molybdate, vanadate, suIfate, chromate, phosphate and arsenate anions did not interfere with the determination. The proposed method has been successfully used for the determination of calcium and magnesium in trimontite with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1996年第10期1200-1203,共4页
Chinese Journal of Analytical Chemistry
关键词
络合滴定法
钨酸铅
白钨矿
钙
镁
Complexometry, lead tungstate, trimontite, calcium, magnesium
