硫酸亚铁电位法滴定金化合物中金含量  

Determination of Gold Content in Gold Compound by Ferrous Sulfate Potentiometry Method

作　　者：何治鸿 He Zhihong(Jiangxi Province Han＇s Ehancellor Precious Metals Limited, Shangrao 335500, Chin)

机构地区：[1]江西省汉氏贵金属有限公司,江西上饶335500

出　　处：《中国资源综合利用》2017年第6期19-23,共5页China Resources Comprehensive Utilization

基　　金：江西省科技型中小企业创新基金项目(项目编号:201040)的阶段性研究成果

摘　　要：本文提出了金化合物(KAu(CN)_2、KAu(CN)_4、KAuCl_4、NaAuCl_4、HAuCl_4、AuCl_3、[(C_6H_5)_3P]AuCl)中金含量的测定方法,经过预处理后,在硫酸与磷酸介质中,在试液中插入铂指示电极和饱和氯化钾甘汞参比电极,调节酸度计至电位档,在电磁搅拌下,用硫酸亚铁标准滴定溶液滴定Au(Ⅲ)至Au(0),至近终点时,再用微量滴定管滴定至电位值突跃最大为终点。方法加标回收率和精密度分别为99.51%~100.45%;RSD≤0.15%。金的质量分数:30.00%~55.00%,允许差:0.20%;金的质量分数:55.00%~70.00%,允许差:0.25%。通过试验结果可知,该方法准确性好,精密度高,准确快速,操作简单。In this paper, gold compounds （KAu （CN）2, KAu （CN）4, KAuC14, NaAuC14, HAuCh, AuC13, [（C6Hs）3P]AuC1） method for the determination of gold content, after pretreatment, in sulfuric acid and phosphoric acid medium is inserted into the platinum indicator electrode and saturated calomel reference potassium chloride than the electrode in solution, regulating pH meter to potential grade in electromagnetic stirring, using ferrous sulfate titrated with the standard solution of Au（III） to Au（0）, to the near＇end point, and then the Microburette titration to jump to the maximum potential value of end point. The method recoveries and precision is 99.51% - 100.45% respectively; RSD ≤ 0.15%. The mass fraction of gold： 30% - 55%; allowable difference： 0.20%; gold mass fraction： 55% - 70%; allowable difference： 0.25%. The test results show that the method is accurate, accurate, accurate, fast and easy to operate.

关 键 词：金化合物 硫酸亚铁 电位滴定法 

分 类 号：TG115.3[金属学及工艺—物理冶金] O657.1[金属学及工艺—金属学]