组合电极-改换介质-阳极溶出伏安法分离重叠峰的研究  

Study on the Anodic Stripping Voltammetry with Exchanging Medium

作　　者：邵勇[1] 张淑云[1] 王曙[1] 

机构地区：[1]四川轻化工学院化工系

出　　处：《冶金分析》1998年第6期15-17,共3页Metallurgical Analysis

摘　　要：采用自制的挂汞电极进行了阳极溶出伏安法改换溶出介质的可行性研究。在１ｍｏｌ／ＬＨＣｌ＋２ｍｏｌ／Ｌ乙二胺溶液中溶出得到再现性较好的Ｐｂ２＋，Ｔｌ＋离子的溶出峰。表明改换介质可分离重叠峰，消除共存离子干扰和提高分析灵敏度。以ＨＣｌ为电解底液，乙二胺溶液为溶出介质时，Ｐｂ２＋浓度在７２×１０－８～２．９×１０－６ｍｏｌ／Ｌ之间与溶出峰高呈线性关系。此方法用于黄铁矿中Ｐｂ２＋的测定。The feasibility of a HDME made by ourselves has been studied for anodic stripping voltammetry with exchanging medium.This electrode keeps electrodeposited metals at mercury drop from oxidation by air when taken out of solution. It is demonstrated that exchanging medium can separate overlapped peaks, remove interferences of other present ions and get high sensitivity. In the electrolyte of HCl, the height of peak is linear with the concentration of lead(Ⅱ) in the range of 7.2×10 -8 -2.9×10 -6 mol/L when ethylenediamine is used for stripping medium. Effects of simple ions have been tested. This method has been successfully applied to the determination of lead(Ⅱ) in a standard mineral sample with prior separation using hydrosulfuryl cottonfiber.

关 键 词：改换介质 阳极溶出伏安法 铅 铊 黄铁矿 

分 类 号：O614.433[理学—无机化学] TF521.4[理学—化学]