电位滴定法测定外购铜物料中的银  

Determination of Silver in Purchased Copper Materials by Potentiometric Titration

作　　者：吕庆成[1] 喻生洁[1] 谢阳 田卫 LYU Qingcheng;YU Shengjie;XIE Yang;TIAN Wei(Jinchuan Group Co.,Ltd.,Jinchang,Gansu 737100,China)

机构地区：[1]金川集团股份有限公司,甘肃金昌737100

出　　处：《中国无机分析化学》2020年第6期45-49,共5页Chinese Journal of Inorganic Analytical Chemistry

摘　　要：研究了用自动电位滴定仪测定外购铜物料样品中经火试金熔炼、富集、灰吹后得到的金银合粒中银的方法。金银合粒用硝酸溶解后在自动电位滴定仪上用硫氰酸钾标准溶液滴定银量,选择了仪器的测定条件,考察了溶液酸度、共存元素对测定的干扰。方法相对标准偏差为1.3%~5.7%,测定结果与硫氰酸钾手工滴定法和减杂法相一致。方法的准确度和精密度均能满足分析需要,具有较强的实用性和推广价值。An automatic potentiometric titration method for the determination of silver in gold silver composite particles obtained from the samples of purchased copper materials after smelting,enrichment and soot blowing by fire assay was investigated in this work.After the gold and silver complex particles were dissolved in nitric acid,the silver content is titrated with potassium thiocyanate standard solution on the automatic potentiometric titrator.The determination conditions of the instrument are selected,and the interference of solution acidity and coexisting elements on the determination was investigated.The relative standard deviation of the method is 1.3%—5.7%,which is consistent with the results of potassium thiocyanate manual titration and impurity reduction.The accuracy and precision of the method could meet the needs of analysis,and it has strong practicability and popularization value.

关 键 词：电位滴定 火试金 银 

分 类 号：O655.2[理学—分析化学]