期刊论文

中文

湘潭大学学报(自然科学学报)

2096-644X

2003

25

3

69-71

10.3969/j.issn.1000-5900.2003.03.021

本校为第一机构

报道了采用茜素紫修饰碳糊电极测定痕量银的阳极溶出伏安法.在0.12 mol/L的醋酸盐缓冲溶液中(pH5.2),在0电位下富集3 min,Ag(I)和茜素紫形成络合物而富集于电极表面,然后通过介质交换至含Br-溶出介质中,阴极还原后再进行阳极溶出伏安测定,灵敏度有显著提高.银的阳极溶出峰电流与Ag(I)浓度在6.0×10-10～1.3×10-7 mol/L范围内呈良好的线性关系,检出限达2.0×10-10 mol/L.同时讨论了电极反应机理及Br-的增敏作用.

A stripping Voltammetric procedure fur determination of trace silver at Alizarin violet(AV) modified carbon paste electrode was developed.In an acetate buffer (pH 5.2) , Silver(I) was accumulated on the electrode surface at 0. 0 V by the formation of the complex of Ag+ - AV, then determined by anodic stripping Vollammetry in 0.05 mol/L H2 SO4 containing 2.0×10 3 mol/L Br after cathodic reduction at - 0.20 V . A well linear relationship between the peak current and the silver(I) concentration was obtained in the range of 6.0×10-10 ~ 1 .3×10~7...