Preparation of Copper Doped L-Threonine Modified Electrode and its Application in Determination of Hydroquinone

A copper doped L-threonine modified electrode was prepared by cyclic voltammetry (CV), and the electrochemical behavior of hydroquinone at the modified electrode had been studied. A novel determination method of hydroquinone using CV, chronoamperometry and differential pulse voltammetry (DPV) was established, and the scan rate and supporting electrolyte factors on catalytic oxidation of hydroquinone in modified electrodes were discussed. The results revealed that the modified electrode had showed obvious electrocatalytic activity for hydroquinone, and anodic peak current increased linearly with the concentration of hydroquinone in the range of 0.8-150 μmol/L with the detection limit of 0.4 μmol/L (S/N=3). The method has been applied to the determination of hydroquinone in water sample with satisfactory results.the recovery ranged from 95.9 % to 105.2 %.