Electrodes with extremely high hydrogen overvoltages as substrate electrodes for stripping analysis based on bismuth-coated electrodes

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• 作者：Ye Tian ; Lianzhe Hu ; Shuang Han ; Yali Yuan ; Jianguo Wang ; Guobao Xu
• 关键词：Carbon paste electrode ; Bismuth ; Stripping analysis ; Dioctyl phthalate ; Hydrogen evolution
• 刊名：Analytica Chimica Acta
• 出版年：2012
• 出版时间：13 August, 2012
• 年：2012
• 卷：738
• 期：Complete
• 页码：41-44
• 全文大小：510 K

文摘

Hydrogen evolution bothers stripping analysis significantly. Dioctyl phthalate-based carbon paste electrode exhibits extremely wide cathodic potential window. It is explored as a powerful substrate electrode to solve the problem of hydrogen evolution and further improve reproducibility for stripping analysis using bismuth-coated electrodes for the first time. It was successfully applied to the simultaneous determination of Zn²⁺, Cd²⁺, and Pb²⁺. Linear responses are obtained for Zn²⁺ in the range of 10-100 ¦Ìg L^?1 and for Pb²⁺ and Cd²⁺ in the range of 5-100 ¦Ìg L^?1. The detection limits for Zn²⁺, Cd²⁺, and Pb²⁺ are 0.1 ¦Ìg L^?1, 0.22 ¦Ìg L^?1 and 0.44 ¦Ìg L^?1, respectively. The method has been successfully applied to the determination of Zn²⁺, Cd²⁺, and Pb²⁺ in waste water samples. The detection strategy based on the combination of dioctyl phthalate-based carbon paste electrode and bismuth-coated electrodes holds great promise for stripping analysis.