阳极溶出伏安法同时测定锌电解液中镉铜钴  

Determination of cadmium,copper and cobalt in zinc electrolyte by anodic stripping voltammetry

作　　者：李源[1] 任凤莲[1] 周恩荣[1] 沈芳[1] 徐亮[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《冶金分析》2011年第10期14-17,共4页Metallurgical Analysis

基　　金：国家863项目(2009AA04Z124)

摘　　要：采用阳极溶出伏安法,建立了在pH 5.0的HAc-NaAc缓冲溶液中,NH4Cl溶液为支持电解质和辅助络合剂,使离子溶出峰电位差增大、峰形尖锐并消除锌离子的影响,抗坏血酸为除氧剂消除氧波干扰的检测体系,可不经预分离直接测定锌电解液中镉(Ⅱ)、铜(Ⅱ)、钴(Ⅱ)三种金属离子。实验结果表明:在该体系中镉(Ⅱ)、铜(Ⅱ)、钴(Ⅱ)的溶出峰电位分别在-0.82、-0.22、+0.02V;校准曲线的线性范围分别在6×10-7～2.5×10-5,3×10-7～3×10-5,1.5×10-6～3.0×10-4 mol/L;方法的检出限分别是3×10-8,2×10-7和1×10-8 mol/L。电解液中可能存在的常见离子对测定无影响。方法用于实际样品的测定,其结果与ICP-AES方法的测定结果一致。A novel determination method of Cd（Ⅱ）,Cu（Ⅱ） and Co（Ⅱ） in zinc electrolyte without preseparation using anodic stripping voltammetry was established,with HAc-NaAc（pH 5.0）as buffer solution,NH4Cl as exchange electrolyte and auxiliary complexing agent which enlarged peak stripping potentials of the ions,sharpened the waveshape and eliminated the effect of Zn（Ⅱ）,and ascorbic acid as deoxidizing agent which eliminated oxidation wave.The results showed that the potential of peak stripping current for Cd（Ⅱ）,Cu（Ⅱ）,Co（Ⅱ） were-0.82 V,-0.22 V and ＋0.02 V（vs.SCE）.The linear range were 6.0×10-7-2.5×10-5,3.0×10-7-3.0×10-5 and 1.5×10-6-3.0×10-4 mol/L.The detection limit were 3×10-8,2×10-7 and 1×10-8 mol/L.The conventional ions that may exist in the electrolyte didn＇t affect the determination.This method was applied to the determination of actual sample,and the results were in coincidence with those by ICP-AES method.

关 键 词：阳极溶出伏安法 锌电解液 镉 铜 钴 

分 类 号：O657.1[理学—分析化学]