Simultaneous Determination Of Catechol And Hydroquinone Based On Fluorinated Graphite Modified Glassy Carbon Electrode

The fluorinated graphite was prepared by fluoridation of pre-oxidized graphite to fabricate modified glassy carbon electrode (FFPGO/GCE). The electrochemical behaviors of catechol (CC) and hydroquinone (HQ) at the modified electrode were investigated by cyclic voltammetry (CV). Effects of experimental parameters such as pH, scan rate, and amount of drop coating on the simultaneous determination of CC and HQ were investigated. Under the optimized conditions, in 0.2 mol/L phosphate buffer solutions (pH 6.0), CC and HQ could be simultaneously determined on the FFPGO/GCE by differential pulse voltammetry (DPV). The oxidation peak current showed a good linear relationship with concentration of CC and HQ in the range of 1.0-150 mu mol/L. The detection limits were 0.31 mu mol/L (S/N = 3) for CC and 0.43 mu mol/L (S/N = 3) for HQ. Furthermore, the modified electrode exhibited good reproducibility, stability and selectivity. The modified electrode was used for determination of CC and HQ in imitative water samples with satisfactory results.