We have demonstrated the effectiveness of differential pulse voltammetry (DPV) as a technique for the preparation of an over oxidized poly (Alizarin Red S) modified disposable pencil graphite electrode (o-PARS/PGE). The modified electrodes were analyzed using spectroscopic, electron microscopic and electrochemical techniques. As an application, the o-PARS/PGE was used for the simultaneous determination of hydroquinone (HQ) and catechol (CC) using DPV and double potential pulse chronoamperometry (DPCA). It was found that o-PARS/PGE exhibited an excellent erectrocatalytic activity and differentiating ability towards HQ and CC with a peak separation of 100 mV. Under the optimized conditions, the calibration curves showed linearity in the range of 0.5-600 mu M for both the isomers with a limit of detection (LOD, 3 sigma/m) of 0.452 mu M and 0.122 mu M for HQ and CC respectively. The practical viability of the fabricated electrode was demonstrated by the successful determination of HQand CC in a tap water sample With satisfactory recovery. On comparison with other commonly employed electrochemical techniques for over oxidation, o-PARS/PGE prepared using DPV was found to be more sensitive. (C) 2017 Elsevier B.V. All tights reserved.