文献类型：期刊文献

英文题名：Simultaneous determination of cadmium(II), lead(II) and copper(II) by using a screen-printed electrode modified with mercury nano-droplets

作者：Song, Wei[1];Zhang, Lei[1];Shi, Lei[1];Li, Da-Wei[1];Li, Yang[1];Long, Yi-Tao[1]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：169

期号：3-4

起止页码：321

外文期刊名：MICROCHIMICA ACTA

收录：;EI(收录号：20242616427754);WOS:【SCI-EXPANDED(收录号:WOS:000277940000016)】；

基金：We greatly appreciate the support of National High Technology Research and Development Program of China (863 Project: 2008AAO6A406).

语种：英文

外文关键词：Heavy metal ions; Multi-walled carbon nanotubes; Chitosan; Mercury nano-droplet; Square wave anodic stripping voltammetry

摘要：We are presenting a strategy for the fabrication of disposable screen-printed electrodes modified with mercury nano-droplets and capable of sensing heavy metal ions. They were prepared by coating electrodes with a mixture of multi-walled carbon nanotubes and chitosan, this followed by adsorption of mercury. The resulting sensor was characterized by cyclic voltammetry and impedance spectroscopy. Also the effects caused by adsorption of mercury were investigated. It is shown that square wave anodic stripping voltammetry enables simultaneous determination of cadmium(II), lead(II) and copper(II), for which detection limits of 12, 23 and 20 nM, respectively, are found. Relative standard deviations for ten determinations at 0.6 A mu M concentrations of these ions are in the range of 3.0 to 5.7%. The applicability was tested by analyzing river water and showed recoveries between 94.1 and 104.6%, thus demonstrating its utility for in-field monitoring of these heavy metal ions.