Cyclic Voltammetric Determination of Hydrogen Peroxide with Taurine Schiff Base Modified Copper Electrode

The modified electrode was prepared by electrodeposition of a film of o-oxy-acetate-benzaldehyde-taurine Schiff base on the surface of copper electrode at the potential range from -1.2 V to 0.6 V (vs.SCE) from a 1 mol·L-1 NaOH solution containing 0.027 g·L-1 o-oxy-acetate-benzaldehyde-taurine Schiff base. The surface property of the modified electrode was studied by scanning electron microscopy, and its electrochemical property studied by cyclic voltammetry. It was found that the modified electrode showed effective catalytic property to H2O2 at -0.18 V in PBS of pH 6.5. Linear relationship between values of reductive peak current and concentration of H2O2 was obtained in the range of 2.576×10-3-1.288×10-2mol·L-1, with value of detection limit (3σ/k) of 4.36×10-5mol·L-1. The proposed method was used for the determination of H2O2 in water samples from river, lake and sewer, giving values of recovery found by standard addition method in the range of 98.7%-105% with RSD′s (n=5) in the range of 1.3%-4.9%.