品红修饰电极的电化学性质及对抗坏血酸测定的研究  

Electrochemical Properties of a Fuchsin-Modified Electrode and Its Application for Ascorbic Acid Determination

作　　者：梁文斌[1,2] 袁若[1,2] 柴雅琴[1,2] 李艳[1,2] 唐点平[1,2] 

机构地区：[1]西南大学化学化工学院,重庆400715 [2]重庆市现代分析化学重点实验室,重庆400715

出　　处：《西南大学学报（自然科学版）》2007年第9期72-76,共5页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20675064);重庆市自然科学基金资助项目(CSTC-2004BB4149;CSTC-2005BB4100);西南大学高新技术培育基金资助项目(XSGX02)

摘　　要：将含有明胶的品红修饰在玻碳电极表面，制备了一种新的品红修饰电极，研究了品红修饰电极的电化学性质，并用于抗坏血酸的测定．在pH=6．0的磷酸盐缓冲溶液中，抗坏血酸在品红修饰的电极上产生一灵敏的氧化峰，在该电极上抗坏血酸的过电位降低约300mV，对抗坏血酸测定的线性范围为4．0×10^-6～3．0×10^-3mol／L，检出限为2．0×10^-6mol／L．该电极测定抗坏血酸简单、准确、快速，而且具有良好的重现性和稳定性。A new electrode was prepared by modifying glutin-containing fuchsin onto the glassy carbon electrode, and its electrocatalytic activity for the oxidation of ascorbic acid was studied. A sharp oxidation peak was obtained, and a decrease of 300 mV in overpotential at the modified glassy carbon electrode was observed. The modified electrode was used to determine the concentration of ascorbic acid in a linear relation between 4.0× 10^-6 and 3.0 × 10^-3 mol/L with a correlation coefficient of 0. 997 1, and the detection limit （S/N=3） was 2.0× 10^-6 mol/L. The method has been applied to determine the ascorbic acid content in real samples with satisfactory results.

关 键 词：品红 抗坏血酸 化学修饰电极 

分 类 号：O657.1[理学—分析化学]