Determination of trace metals by anodic stripping voltammetry using a bismuth-modified carbon nanotube electrode

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• 作者：Gil Ho Hwang ; Won Kyu Han ; Joon Shik Park ; Sung Goon Kang
• 关键词：Carbon nanotubes ; Bismuth film ; Screen printing ; Anodic stripping voltammetry ; Heavy metal
• 刊名：Talanta
• 出版年：2008
• 出版时间：15 July 2008
• 年：2008
• 卷：76
• 期：2
• 页码：301-308
• 全文大小：1192 K

文摘

A bismuth-modified carbon nanotube electrode (Bi-CNT electrode) was employed for the determination of trace lead, cadmium and zinc. Bismuth film was prepared by in situ plating of bismuth onto the screen-printed CNT electrode. Operational parameters such as preconcentration potential, bismuth concentration, preconcetraion time and rotation speed during preconcentration were optimized for the purpose of determining trace metals in 0.1 M acetate buffer solution (pH 4.5). The simultaneous determination of lead, cadmium and zinc was performed by square wave anodic stripping voltammetry. The Bi-CNT electrode presented well-defined, reproducible and sharp stripping signals. The peak current response increased linearly with the metal concentration in a range of 2–100 μg/L. The limit of detection was 1.3 μg/L for lead, 0.7 μg/L for cadmium and 12 μg/L for zinc (S/N = 3). The Bi-CNT electrode was successfully applicable to analysis of trace metals in real environments.