电流氧化溶出计时电位法直接测定地质物料中微量铅  

Determination of Trace Lead in Geological Materials by Current Oxidating Stripping Chronopotentiometry

作　　者：张勤 周丽沂 袁倬斌[1] 

机构地区：[1]河北廊坊地矿部物化探所,北京中国科大研究生院

出　　处：《冶金分析》1994年第6期1-4,共4页Metallurgical Analysis

摘　　要：本文介绍了在０．２ｍｏｌ／ＬＨＮＯ３－０．５ｍｇＦｅ（３＋）－０．１ｍｏｌ／Ｌ抗坏血酸介质中用电流氧化溶出计时电位法直接测定地质物料中微量铅的新方法。方法检出限０．１５μｇ／ｇ，线性范围２～７００ｎｇ／ｍｌ，Ｐｂ的含量水平分别为１１．３和５８．５μｇ／ｇ时的精密度（ＲＳＤ）分别为３．４２％和３．０８％，回收率９５．００％～９８．８％。文中对所选测定体系的增敏机理做了研究，考察了４０种干扰离子对测定Ｐｂ的影响。用本法分析了２６个国家一级标准物质中微量Ｐｂ，结果与标准值一致。A new method was developed for determination of trace lead in geological materials by current oxidating stripping chronopotentiometry in the medium of 0.2 mol/L HNO8-0.5mg Fe3+-0.1mol/L ascorbic acid.We have studied the enhancement mechanism of the system and the interferences among more then 40 elements to Pb. Under the optimum conditions selected, the detection limit of Pb is 0.15μg/g in the sample.The dynamic linear working range is 2-700ng/ml.The relative standard deviations (RSD) are 3.42% and 3.08% in the levels of 11.2μg/g and 59.6μg/g, respectively.Twenty-six geochemical reference materials (GSR1-6, GSS1-8, GSD1-12) were determined by the method.The results obtained are good agreements with the certified values.

关 键 词：溶出计时电位法 地质物料 铅 测定 

分 类 号：P574.2[天文地球—矿物学]