双向溶出伏安法同时检测金和铜  

Simultaneous Determination of Gold(Ⅲ) and Copper(Ⅱ) with Two-way Stripping Voltammetry

作　　者：胡荣宗[1] 韦冬萍[2] 魏光[1] 刘月英[3] 

机构地区：[1]厦门大学化学系国家固体表面物理化学重点实验室,福建厦门361005 [2]广西民族学院化学化工系,广西南宁530006 [3]厦门大学生物学系,福建厦门361005

出　　处：《电化学》2001年第3期339-344,共6页Journal of Electrochemistry

基　　金：国家固体表面物理化学重点实验室资助项目

摘　　要：本文首次提出双向溶出伏安法 ,并将该方法用于同时检测水溶液中的Au(Ⅲ )和Cu(Ⅱ ) .采用细菌修饰的碳糊电极做工作电极 ,于阳极富集 ,阴极溶出测定Au(Ⅲ ) ,同时在碳糊电极上再修饰上一层超细微粒金膜 .然后 ,在金电极上进行阴极富集 ,阳极溶出检测Cu(Ⅱ ) .该法仪器设备简单、操作简便 .Au(Ⅲ )与Cu(Ⅱ )的检测信号分别在阴极、阳极两个方向显示 ,分辨率高 .Au(Ⅲ )在 0 .2～ 1μg/mL、Cu(Ⅱ )在 2～ 10ng/mL浓度范围内 ,均有良好线性关系 ,其检测限依次为 2 0ng/mL和 0 .5ng/mL ,8次平行测定RSD小于 3%A novel Two_way Stripping Voltammetry method for simultaneous determination of Au 3+ and Cu 2+ was reported in this paper. Because of the strongly electrostatic attraction of carbon paste electrode towards Au(Ⅲ) ion at positive potential and the biochemical contribution of Gram_positive bacteria strain DO1, the ion can be determined by cathodic stripping voltammetry. At the same time, Cu(Ⅱ) is reduced readily under the catalysis of ultra_fine gold particles, thereafter it can be determined by anode stripping voltammetry. There is no interference between the determination of Au 3+ and Cu 2+ . A perfect liner relationship between the concentrations of cations and peak heights in the range of 0.2～1.0 μg/mL(Au 3+ ) and 2～10 ng/mL(Cu 2+ ) respectively were observed. The detection limit is 20 ng/mL for Au(Ⅲ), and 0.5 ng/mL for Cu(Ⅱ). The relative standard deviation of the response to 5 μg/mL Au 3+ and 60 ng/mL Cu 2+ are less than 3%.

关 键 词：双向溶出伏安法 修饰电极 碳糊电极 金 铜 同时检测 电化学分析 

分 类 号：O657.1[理学—分析化学]