Screen-printed Prussian Blue modified electrode for simultaneous detection of hydroquinone and catechol

A simply and high selectively electrochemical method for simultaneous determination of hydroquinone( HQ) and catechol (CC) has been developed at an electrochemically activated screen-printed carbonelectrode (SPCE) modified with Prussian Blue (PB). The PB acted as a mediator and thereby enhancedthe rate of electron transfer in chemical reaction. Various optimization studies such as the pH of themeasuring solution, linear range of response, sensitivity and detection limit, were conducted to obtainmaximum amperometric responses for analytes measurement. Differential pulse voltammetry (DPV) wasused for the simultaneous determination of HQ and CC in their mixture, and the peak-to-peak separationfor HQ and CC was about 0.11 V. The two corresponding well-defined oxidation peaks of HQ and CCat activated Prussian Blue-modified screen-printed carbon electrode (PB-SPCE) occur at -0.012 V and+ 0.094 V, respectively. Under the optimized condition in DPV, the oxidation peak current of HQ and ofCC is linear over a range from 4.0 x 10(-6) M to 9.0 x 10(-5) M HQ and from 1.0 x 10(-6) M to 9.0 x 10(-5) M CC. The obtained detection limit for HQ and CC was 1.17 x 10-7M and 4.28 x 10(-7) M, respectively. DPV canbe used for individual or simultaneous determination of HQ and CC. The proposed activated PB-SPCEwas successfully applied to the simultaneous determination of HQ and CC in spiked tap water. Using thestandard addition method, the average recovery of the proposed method based on activated PB-SPCE was99.03% and 95.87% for HQ and CC, respectively. (C) 2014 Elsevier B. V. All rights reserved.