【作者】 李丽敏； 刘莉； 张增辉； 张宁；

【Author】 LI Li-min;Liu Li;Zhang Zeng-hui;Zhang Ning;Department of Chemistry and Chemical Engineering, Weifang College;

【机构】 潍坊学院化学化工学院；

【摘要】 采用直接混合法将三氯乙酸铜咪唑配合物与石墨粉、液体石蜡及离子液体按一定比例研磨均匀,制备了修饰碳糊电极。研究了电极的电化学性质,发现该电极对抗坏血酸具有良好的电催化氧化作用,并探索了修饰碳糊电极测定抗坏血酸的实验条件。结果表明:修饰碳糊电极在p H=6.5的磷酸盐(PBS)缓冲溶液中,于0.60V~-0.20V的电位范围内,以100m V/s的扫描速度进行循环伏安扫描。催化电流峰在3.0×10-6~7.0×10-4mol/L范围内有良好的线性关系。对三种维生素C片剂中的抗坏血酸含量进行测定,RSD在1.5~2.6%之间,回收率在98.4%~102.5%之间。更多还原

【Abstract】 The modified carbon paste electrode has been preparated with graphite, liquid paraffin, ionic liquids and trimethoxysilane copper acetate imidazole complexes by directly hybrid method. It has been investigated the electrochemical behaviour of carbon paste electrode by using cyclic voltammetry and Ac impedance. The results show that it has good electrocatalytic oxidization to ascorbic acid. In p H6.5 phosphate buffer solution,the peak height of the adsorptive wave was directly proportional to the concentration of ascorbic acid in the range 3.0×10-6~7.0×10-4mol/L. The method has been applied to the determination of the ascorbic acid in Vitamin C with satisfactory results. The methods RSD is in the range of 1.5%~2.6% and recovery in 98.4%~102.5%.更多还原