二茂铁甲酸/L-半胱氨酸修饰金电极的制备及对抗坏血酸的电催化测定

Preparation for Ferrocene Carboxylic Acid Modified Goldelectrode and Electrocatalytical Oxidation of Ascorbic Acid

实验制备了二茂铁甲酸/L-半胱氨酸自组装金电极,并用循环伏安法和电化学阻抗予以表征,研究了该电极在磷酸氢钾—磷酸氢二钾溶液(pH=7.0)中的电化学行为,考察了介质、酸度对修饰电极伏安行为的影响。实验表明,该电极对抗坏血酸(AA)的电化学氧化具有明显的催化作用。用示差脉冲伏安法对AA进行了测定,其氧化电流于AA的浓度在2.52×10-5-6.31×10-3molL-1范围内呈良好的线性关系,线性相关系数为0.9931,检出限为1.30×10-6mol L-1.

Ferrocene carboxylic acid /L-cysteine self-assembled tokened by cyclic voltammetry and electrochemistry impedance. gold electrode is prepared in this experiment. It is The electrochemical behavours of ferrocene carboxylic acid modified gold electrode are investgated in phosphorate buffer solution （pH=7.0）, and the effect of medium and acidity on the cyclic voltammograms is investgated, too. The result obtained shows that the modified electrode exhibites a notable electrocatalytic response to the oxidation of ascorbic acid . The current is proportional to the concentration of ascorbic acid in the range of 2. 52×10^-5-6.31×10^-3mol L^-1. The detection limit is 1.30×10^-6 and the correlative cofficient is 0. 9931.