Simultaneous determination of hydroquinone and catechol using poly(<i>p</i>‐aminobenzoic acid) modified glassy carbon electrode

Abstract

Abstract The electrochemical redox reaction of hydroquinone (HQ) and catechol (CC)was investigated with poly‐( p ‐aminobenzoic acid) modified glassy‐carbon electrode (poly‐ p ‐ABA/GCE) via cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The poly‐ p ‐ABA/GCE has shown an excellent electrocatalytic activity for HQ and CC in 0.1 mol L −1 phosphate buffer solution (PBS). The oxidation and reduction separation (Δ E ) has been decreased from 353 to 32 mV for HQ and from 228 to 33 mV vs. SCE for CC at the bare GCE and poly‐ p ‐ABA/GCE respectively. DPV curves show that the oxidation potential of HQ and CC has a separation about 105 mV at the poly‐ p ‐ABA/GCE. Moreover, the oxidation current of HQ and CC has been enhanced two and four times respectively at the modified electrode. Using DPV method, a highly selective and simultaneous determination of HQ and CC has been explored at the poly‐ p ‐ABA/GCE. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009