聚对氨基吡啶化学修饰电极上酚磺乙胺的电化学行为及其溶出伏安法测定

Voltammetric Behavior of Dicynonum at Poly(4-aminopyridine) Film Modified Electrode and Its Determination by Adsorptive Stripping Voltammetry

在玻碳电极上制备了聚对氨基吡啶 (POAP)修饰膜电极 ,并用POAP电极研究了酚磺乙胺 (DIC)的电化学行为。POAP修饰电极对DIC的氧化有良好的电催化活性。循环伏安图上出现一对灵敏、可逆的氧化还原峰。在最佳条件下 ,氧化峰电流与DIC浓度在 4.0× 10 -8～ 1.0× 10 -3 mol/L范围内呈良好线性关系 ,开路富集 5min检测限达 7.6× 10 -10 mol/L。用POAP测定DIC具有良好的重现性。

A poly(4-aminopyridine) (POAP) modified electrode was prepared at glassy carbon electrode. The electrochemical behavior of dicynonum (DIC) using this modified electrode was studied, the POAP electrode Showed excellent electrocatalytic activity for the oxidation of dicynonum. A couple of sensitive and reversible redox peaks were obtained from the cyclic voltammograms. The relationship between oxidation peak current and the concentration of DIC was linear in the range of 4.0 x 10(-8) similar to 1.0 x 10(-3) mol/L under the optimum conditions. The detection limit has been estimated as 7.6 x 10(-10) mol/L with 5 min open circuit accumulation. The POAP electrode showed excellent reproducibility, sensitivity and stability for the determination of DIG.