Determination of trace amounts of lead and cadmium using a bismuth/glassy carbon composite electrode
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- 作者：Gil-Ho Hwang ; Won-Kyu Han ; Seok-Jun Hong ; Joon-Shik Park ; Sung-Goon Kang
- 关键词：Bismuth ; Composite electrode ; Electrochemical dissolution ; Anodic stripping voltammetry ; Trace metals
- 刊名：Talanta
- 出版年：2009
- 出版时间：15 February 2009
- 年：2009
- 卷：77
- 期：4
- 页码：1432-1436
- 全文大小：483 K
文摘
We examined the use of a bismuth–glassy carbon (Bi/C) composite electrode for the determination of trace amounts of lead and cadmium. Incorporated bismuth powder in the composite electrode was electrochemically dissolved in 0.1 M acetate buffer (pH 4.5) where nanosized bismuth particles were deposited on the glassy carbon at the reduction potential. The anodic stripping voltammetry on the Bi/C composite electrode exhibited well-defined, sharp and undistorted peaks with a favorable resolution for lead and cadmium. Comparing a non-oxidized Bi/C composite electrode with an in-situ plated bismuth film electrode, the Bi/C composite electrode exhibited superior performance due to its much larger surface area. The limit of detection was 0.41 μg/L for lead and 0.49 μg/L for cadmium. Based on this study, we are able to conclude that various types of composite electrodes for electroanalytical applications can be developed with a prudent combination of electrode materials.