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采用一种简单灵敏的方法开发了在多壁碳纳米管修饰的ZnCrFeO_4糊电极(MWCNTs/ZnCrFeO_4/CPE)表面测定苄丙酮香豆素的新型传感器.运用循环伏安法、差示脉冲伏安法、计时电流法和电化学阻抗谱考察了该化学修饰电极上苄丙酮香豆素的电化学性能.结果表明,MWCNTs/ZnCrFeO_4/CPE电极对苄丙酮香豆素氧化表现出较高的电催化活性,在pH=4时,产生峰值氧化电流约0.97 vs Ag/AgCl参比电极.当苄丙酮香豆素浓度在0.02–920.0μmol/L范围内,该峰电流与其呈线性关系,检测极限(3σ)为0.003μmol/L.另外,运用差示脉冲伏安法测定了MWCNTs/ZnCrFeO_4/CPE电极上苄丙酮香豆素的催化反应速率常数和扩散系数.
A simple and sensitive method was developed to develop a novel sensor for the determination of warfarin on the surface of MWCNTs / ZnCrFeO_4 / CPE modified MWNTTs / ZnCrFeO_4 / CPE. The cyclic voltammetry and differential pulse voltammetry , Chronoamperometry and electrochemical impedance spectroscopy were used to investigate the electrochemical properties of warfarin on the chemically modified electrode.The results showed that MWCNTs / ZnCrFeO_4 / CPE electrode exhibited higher electrocatalytic activity for warfarin oxidation , A peak oxidation current of about 0.97 vs Ag / AgCl reference electrode was generated at pH = 4. The peak current was linearly related to the concentration of warfarin in the range of 0.02-920.0 μmol / L, and the detection limit (3σ ) Was 0.003μmol / L. In addition, the catalytic reaction rate constant and diffusion coefficient of warfarin on MWCNTs / ZnCrFeO_4 / CPE electrode were measured by differential pulse voltammetry.