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.
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)
出处
《贵金属》
CAS
CSCD
北大核心
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)
关键词
分析化学
银
杂质元素
氯化银
硫氰化银
analytical chemistry
silver
impurities
silver chloride
silver thiocyanate
