Hwang Gil-Ho, Han Won-Kyu, Hong Seok-Jun, Park Joon-Shik, Kang Sung-Goon
Department of Materials Science and Engineering, Hanyang University, Seongdong, Seoul, Republic of Korea.
Talanta. 2009 Feb 15;77(4):1432-6. doi: 10.1016/j.talanta.2008.09.028. Epub 2008 Sep 26.
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 0.1M 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 microg/L for lead and 0.49 microg/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.
我们研究了使用铋 - 玻碳（Bi/C）复合电极测定痕量铅和镉。复合电极中掺入的铋粉在0.1M醋酸盐缓冲液（pH 4.5）中进行电化学溶解，在还原电位下纳米尺寸的铋颗粒沉积在玻碳上。Bi/C复合电极上的阳极溶出伏安法显示出明确、尖锐且未变形的峰，对铅和镉具有良好的分辨率。将未氧化的Bi/C复合电极与原位镀铋膜电极进行比较时，Bi/C复合电极因其大得多的表面积而表现出优异的性能。铅的检测限为0.41μg/L，镉的检测限为0.49μg/L。基于这项研究，我们能够得出结论，通过谨慎组合电极材料，可以开发出用于电分析应用的各种类型的复合电极。
