沉淀方式对ICP-AES法测定纯银中铅和镉的影响  

The Effects of Precipitation Method on Determination of Pb and Cd by ICP-AES in Pure Silver

作　　者：刘雪松 孔祥冰 李桂华 黄准 王萍 张凤霞 LIU Xuesong;KONG Xiangbing;LI Guihua;HUANG Zhun;WANG Ping;ZHANG Fengxia(National Gold & Diamond Testing Center, Shandong Institute of Metrology, Jinan 250014, China;Social Justice and Measurement Station of Shandong Province, Jinan 250014, China)

机构地区：[1]山东省计量科学研究院国家黄金钻石制品质量监督检验中心,济南250014 [2]山东省社会公正计量行,济南250014

出　　处：《贵金属》2018年第1期64-67,共4页Precious Metals

基　　金：山东省质量技术监督局科研项目(2016KY05)

摘　　要：用硝酸溶解纯银样品,分别加入盐酸和硫氰化钾沉淀分离银基体,用电感耦合等离子体原子发射光谱(ICP-AES)测定试液中的铜、锌、铬、铅和镉。结果表明,采用氯化银沉淀,铅和镉会被吸附,回收率和相对标准偏差(RSD)不能满足测定要求;采用硫氰化银沉淀可以避免对铅和镉的吸附,满足测定要求。The silver sample was dissolved in nitric acid,and then separated the dissolved silver matrix by either hydrochloric acid or potassium thiocyanate precipitation methods.The concentrations of copper,zinc,chromium,lead and cadmium in sterling silver were determined by inductively coupled plasma atomic emission spectrometry(ICP-AES).The results showed that lead and cadmium were adsorbed by AgCl for the HCl precipitation method,and that its recovery and relative standard deviation(RSD)did not meet the determination requirements.However,the AgSCN precipitation method meets the requirements of determination in that there was no adsorption of lead and cadmium by silver thiocyanate.

关 键 词：分析化学 银 杂质元素 氯化银 硫氰化银 

分 类 号：O657.31[理学—分析化学]