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研究论文

双向溶出伏安法同时检测金和铜

  • 胡荣宗 ,
  • 韦冬萍 ,
  • 魏光 ,
  • 刘月英
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  • 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,广西民族学院化学化工系!广西南宁530006,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,厦门大学生物学系!福建厦门361005

收稿日期: 2001-08-28

  修回日期: 2001-08-28

  网络出版日期: 2001-08-28

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

  • HU Rong_zong ,
  • WEI Dong_ping ,
  • WEI Guang ,
  • LIU Yue_ying
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  • (1. Chem. Dept.,State Key Lab.for the Phys.Chem. of the Solid Surface,Xiamen University, Xiamen 361005,China; 2. Chem. Dept. and Chemical Engineering,Guangxi National College, Nannin

Received date: 2001-08-28

  Revised date: 2001-08-28

  Online published: 2001-08-28

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%

本文引用格式

胡荣宗 , 韦冬萍 , 魏光 , 刘月英 . 双向溶出伏安法同时检测金和铜[J]. 电化学, 2001 , 7(3) : 339 -344 . DOI: 10.61558/2993-074X.1430

Abstract

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%.

参考文献

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