Highly sensitive detection of Cr⁶⁺ on boron doped diamond electrodes

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• 作者：St¨¦phane Fierro ; Takeshi Watanabe ; Kazumi Akai ; Yasuaki Einaga
• 关键词：Chromium detection ; Cyclic and linear scan voltammetry ; Boron doped diamond electrodes
• 刊名：Electrochimica Acta
• 出版年：2012
• 出版时间：1 November, 2012
• 年：2012
• 卷：82
• 期：Complete
• 页码：9-11
• 全文大小：481 K

文摘

Electrochemical detection of Cr⁶⁺ has been performed by cyclic and linear scan voltammetry on boron doped diamond (BDD) electrode. This method is based on the electrochemical reduction of Cr⁶⁺ to Cr³⁺. The resulting voltammograms exhibited a clear peak at 0.03 V vs. AgCl related to this reduction and highly accurate (r² = 0.99) calibration curves could be obtained for a chromium concentration range between 10 ppb and 5 ppm. The influence of other metals dissolved in solution (Cu, Cd, Pb, B and Se) has been investigated as well and it was found that the Cr⁶⁺ calibration curves remained unaltered. For all the experiments performed, a detection limit around 3 ppb was achieved. The high accuracy and reproducibility of the results as well as the excellent stability of the electrode material proves the excellent capabilities of this system for chromium detection.