Electrocatalytic Activity and Determination of Hydroquinone by Glassy Carbon Electrode Modified with Nickel Schiff Base Complex

An amperometric hydroquinone sensor based on N,N′-bis(salicylidene)-1,2-cyclohexanediaminonickel(Ⅱ)(Ni(Ⅱ)-salch) film coated glass carbon electrode(GCE) was developed.The results of cyclic voltammetry suggested that the modified electrode exhibited high electrocatalytic activity and stability for hydroquinone.Hydroquinone was determined based on the reduction current measured by linear scan voltammetry.A linear response was obtained between the reduction current and hydroquinone concentration in the range from 1.5×10-6 to 6.5×10-4 mol/L.The detection limit was 9.8×10-7 mol/L with correlation coefficient of 0.9941.For 10 replicate measurements of 5.0×10-5 mol/L hydroquinone,the relative standard deviation was found to be 1.9%.The modified electrode was applied to the determination of hydroquinone in photographic imaging waste water with satisfactory results.