硫酸亚铁铵还原-重铬酸钾返滴定法测定18K金首饰中的金含量  

Determination of Gold Content in 18K Gold Jewelry Using Ammonium Ferrous Sulfate Reduction Potassium Dichromate Back Titration Method

作　　者：王鑫磊 邵锦兴 金绪广 王金砖 陈栋 Wang Xinlei;Shao Jinxing;Jin Xuguang;Wang Jinzhuan;Chen Dong(Nanjing Product Quality Supervision and Inspection Institute(Nanjing Quality Development and Advanced Technology Application Research Institute),Jiangsu,210019;National Center for Quality Inspection and Testing of Gold and Silver Products(Nanjing),Jiangsu,210019;Dongguan Jinlong Jewelry Co.,Ltd.,Guangdong,523943)

机构地区：[1]南京市产品质量监督检验院(南京市质量发展与先进技术应用研究院),江苏210019 [2]国家金银制品质量检验检测中心(南京),江苏210019 [3]东莞市金龙珠宝首饰有限公司,广东523943

出　　处：《当代化工研究》2024年第4期62-64,共3页Modern Chemical Research

摘　　要：研究了用硫酸亚铁铵还原金,重铬酸钾滴定过剩的硫酸亚铁铵,间接测定18K金首饰中金含量的方法,阐述了样品前处理、不同银铜含量的样品溶解方式,考察了共存元素的影响、方法的准确度和精密度,确定了方法适用范围。A method for indirectly determining the gold content in 18K gold jewelry by reducing gold with ammonium ferrous sulfate and titrating excess ammonium ferrous sulfate with potassium dichromate was studied.Sample pretreatment and dissolution methods with different silver and copper contents were described.The influence of coexisting elements,accuracy and precision of the method were investigated,and the applicability of the method was determined.

关 键 词：硫酸亚铁铵 重铬酸钾 18K金 返滴定法 金含量 

分 类 号：O655[理学—分析化学]