Direct Determination of Hydroquinone with a Novel Multi-walled Carbon Nanotubes/Chitosan/Ionic Liquid Modified Electrode

A novel multi-walled carbon nanotubes/chitosan/ ionic liquids(PF6) modified electrode was constructed.The influences of the type of electrolyte,the acidity of the supporting solution and the scan rates on the voltammetric behaviors of hydroquinone(HQ) were also studied to obtain optimum conditions for detecting HQ.In 0.1 mol/L phosphate buffer(pH=6.8),the oxidation peak current of HQ was increased linearly with the concentration in the range of 8.0×10-7～1.0×10-4 mol/L with the detection limit of 7.9×10-8 mol/L.It was found that all the studied coexisting substances,especially phenolic compounds,could be tolerated in considerable amounts.The proposed method was successfully used for direct determining trace amounts of HQ in practical environmental water samples with satisfactory results.