一种EDTA测定含钡矿物中铅含量的新方法  

One new method for determination of lead content in minerals containing barium by EDTA

作　　者：施宏娟[1] SHI Hong-juan

机构地区：[1]昆明冶金研究院

出　　处：《中国有色冶金》2019年第3期65-67,共3页China Nonferrous Metallurgy

摘　　要：基于硫酸钡不溶于乙酸-乙酸钠缓冲溶液,而硫酸铅能完全溶解于该缓冲液的特性,在氨性溶液中加入硫酸钾使钡离子沉淀为硫酸钡,然后加入1∶1的硫酸使铅离子沉淀,在pH值为5.5~6.0的乙酸-乙酸钠缓冲溶液中,通过EDTA标准溶液滴定测定含钡矿物中铅的含量。该方法能有效消除钡离子的影响,测定终点稳定,操作简便,且与国家标准方法GB/T8152.2—2006中的硫酸铅沉淀-EDTA返滴定法结果一致。Based on the fact that barium sulfate is insoluble in HAc-NaAc buffer solution,while lead sulfate can be completely dissolved in buffer solution,barium ions are precipitated into barium sulfate when adding potassium sulfate into ammonia solution,lead ions are precipitated when adding sulphuric acid,in HAc-NaAc buffer solution with a pH of between 5.5~6.0,the contents of lead in minerals containing barium is determined by EDTA standard solution titration.The method could effectively eliminate the influence of barium ion,the end point is stable,easy operation,the results are consistent with those of lead sulfate precipitation-EDTA back titration method in GB/T 8152.2-2006.

关 键 词：EDTA 含钡矿物 铅 

分 类 号：TF03.1[冶金工程—冶金物理化学]