Electrochemical characteristics of hydroquinone (HQ), catechol (CC) and resorcinol (RC) were investigated at glassy carbon electrode (GCE) modified with poly(3-thiophenemalonic acid) by cyclic voltammetry (CV). The effect of key parameters on the detection of three substances was evaluated at the modified electrode, such as immerging time, scanning rate and so on. Under optimum conditions, the catalytic oxidation currents increased linearly with increasing the concentration of HQ, CC and RC in the ranges of 7.81~500 μM, 3.91~500 μM and 15.6~500 μM with detection limits of 7.81 μM, 3.91μM and 15.6 μM, respectively, by differential pulse voltammetry (DPV). In addition, the modified electrodes exhibited good sensitivity, selectivity, reproducibility and stability. The modified electrode can be used for the selective detecting the hydroquinone, catechol and resorcinol.
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Xu et al. (2015) studied this question.
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