期刊
TALANTA
卷 77, 期 4, 页码 1432-1436出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2008.09.028
关键词
Bismuth; Composite electrode; Electrochemical dissolution; Anodic stripping voltammetry; Trace metals
资金
- Korea Research Foundation
- Korean Government (MOEHRD) [KRF-2007-D00185-102466]
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 mu g/L for lead and 0.49 mu g/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. (C) 2008 Elsevier B.V. All rights reserved.
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