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%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
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)
关键词
EDTA滴定法
铅矿石
铋
消除干扰
EDTA titration
Lead ores
Bismuth
Elimination of interference
