Covalent modification of a glassy carbon electrode with penicillamine for simultaneous determination of hydroquinone and catechol |
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Authors: | Liang Wang Peng Fei Huang Jun Yue Bai Hong Jing Wang Li Ying Zhang Yu Qing Zhao |
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Institution: | (1) College of Biological Science, Dalian Nationalities University, 116600 Dalian, China;(2) School of Environmental and Biological Science and Technology, Dalian University of Technology, 116024 Dalian, China |
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Abstract: | A simple and highly selective electrochemical method has been developed for the simultaneous determination of hydroquinone
(HQ) and catechol (CC) at a glassy carbon electrode covalently modified with penicillamine (Pen). The electrode is used for
the simultaneous electrochemical determination of HQ and CC and shows an excellent electrocatalytical effect on the oxidation
of HQ and CC upon cyclic voltammetry in acetate buffer solution of pH 5.0. In differential pulse voltammetric measurements,
the modified electrode was able to separate the oxidation peak potentials of HQ and CC present in binary mixtures by about
103 mV although the bare electrode gave a single broad response. The determination limit of HQ in the presence of 0.1 mmol L−1 CC was 1.0 × 10−6 mol L−1, and the determination limit of CC in the presence of 0.1 mmol L−1 HQ was 6.0 × 10−7 mol L−1. The method was applied to the simultaneous determination of HQ and CC in a water sample. It is simple and highly selective. |
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Keywords: | : Chemically modified electrode penicillamine hydroquinone catechol electrochemistry |
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