Electrochemical Determination of Pyrogallol at Conducting Poly(3,4‐ethylenedioxythiophene) Film‐Modified Screen‐Printed Carbon Electrodes |
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Authors: | Cheng‐Hsien Hung Wei‐Ting Chang Wan‐Yu Su Shu‐Hua Cheng |
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Institution: | Department of Applied Chemistry, National Chi Nan University, Puli, Nantou Hsien 545, Taiwan |
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Abstract: | The electrochemical oxidation of pyrogallol at electrogenerated poly(3,4‐ethylenedioxythiophene) (PEDOT) film‐modified screen‐printed carbon electrodes (SPCE) was investigated. The voltammetric peak for the oxidation of pyrogallol in a pH 7 buffer solution at the modified electrode occurred at 0.13 V, much lower than the bare SPCE and preanodized SPCE. The experimental parameters, including electropolymerization conditions, solution pH values and applied potentials were optimized to improve the voltammetric responses. A linear calibration plot, based on flow‐injection amperometry, was obtained for 1–1000 µM pyrogallol, and a slope of 0.030 µA/µM was obtained. The detection limit (S/N=3) was 0.63 µM. |
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Keywords: | Screen‐printed carbon electrodes Poly(3 4‐ethylenedioxythiophene) Pyrogallol Cyclic voltammetry Flow‐injection amperometry |
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