EDTA滴定法测定铅矿石中铅含量时铋的干扰及消除  

Elimination of Interference of Bismuth in Determination of Lead in Lead Ores by EDTA Complexometric Titration

作　　者：袁永海[1,2,3] 尹昌慧[3] 唐沈[4] 刘苏桥[1,2] 

机构地区：[1]桂林理工大学广西隐伏金属矿产勘查重点实验室,桂林541004 [2]桂林理工大学地球科学学院,桂林541004 [3]中国有色桂林矿产地质研究院有限公司,桂林541004 [4]桂林理工大学环境科学学院,桂林541004

出　　处：《理化检验（化学分册）》2016年第12期1397-1399,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：广西科学研究与技术开发计划项目(桂科能141123006-16)

摘　　要：EDTA滴定法测定铅矿石中铅含量时铋形成正干扰。加入2，3-二巯基丙醇为掩蔽剂，可使铋与其反应生成稳定络合物，从而消除其对铅测定时的干扰。应用此方法分析了标准样品（GBW07172，GBW07167和BY0111-1），测定值与认定值相符，测定值的相对标准偏差（n=6）在0．14％-0．63％之间。In the determination of lead in lead ores by titration with EDTA, high results of lead were obtained due to interference of bismuth. 2,3-Dimercapto-l-propanol was used as masking agent to react with Bi（Ⅲ） to form a stable complex, and thus to eliminate its interference. The proposed method was applied to the determination of lead in 3 CRM＇s （GBW 07172, GBW 07167 and BY 0111-1）, giving results in consistency with the certified values with RSD＇s （n=6） in the range of 0. 14%-0. 63%.

关 键 词：EDTA滴定法 铅矿石 铋 消除干扰 

分 类 号：O655.2[理学—分析化学]