重铬酸钾滴定法测定废杂铜中的铁含量  

Determination of Iron in Scrap Copper by Dichromate Titration Method

作　　者：苗晓焕 冯振华 MIAO Xiaohuan;FENG Zhenhua(BGRIMM MTC Technology Co.,Ltd.,Beijing 102628,China;Beijing Key Laboratory for Evaluation and Testing of Metallic Mineral Resources,Beijing 102628,China)

机构地区：[1]北矿检测技术有限公司,北京102628 [2]金属矿产资源评价与分析检测北京市重点实验室,北京102628

出　　处：《中国无机分析化学》2021年第4期67-71,共5页Chinese Journal of Inorganic Analytical Chemistry

基　　金：国家重点研发计划(2016YFF0102500)。

摘　　要：研究了废杂铜中铁含量的测定方法。试料采用盐酸、硝酸、高氯酸溶解,加入过量氨水生成氢氧化铁沉淀与铜、铬等干扰元素分离,沉淀用热盐酸溶解后,用氯化亚锡还原至溶液呈浅黄色,重铬酸钾滴定法测定铁含量。探讨了溶样方式、氯化铵用量、氨水过量的体积、硫磷混酸用量对测定结果的影响。对4个废杂铜样品中的铁含量进行测定,测定结果的相对标准偏差RSD(n=11)为0.38%~0.95%,加标回收率为99.4%~100%,方法准确可靠,能够满足测定要求。The determination method of iron content in scrap copper was studied.The samples are dissolved by hydrochloric acid,nitric acid and perchloric acid,and added with excessive ammonia to form ferric hydroxide precipitation and separated from interfering elements such as copper,chromium and other interfering elements.The precipitate is dissolved with hot hydrochloric acid,and the stannous chloride is used for reduction until the solution is reduced to pale yellow,then titrate with potassium dichromate to determine the content of iron.The influence on the determination was discussed including the method of sample dissolution,the amount of ammonium chloride,the excess volume of ammonia and the amount of sulfur-phosphorus mixed acid.According to the method,the content of iron in four scrap copper samples was determined.The relative standard deviation(RSD)of the method was 0.38%-0.95%,and the recovery of the sample was 99.4%-100%.The method is accurate and reliable,which is suitable for the determination of iron content in scrap copper.

关 键 词：废杂铜 铁 重铬酸钾法 

分 类 号：O655.2[理学—分析化学]