Determination of ascorbic acid by electrocatalytic voltammetry with methylene blue

被引：21
作者：
Ensafi, AA [1 ]
机构：
[1] Isfahan Univ Technol, Coll Chem, Esfahan 84156, Iran
来源：
ANALYTICAL LETTERS | 2003年 / 36卷 / 03期
基金：
加拿大自然科学与工程研究理事会;
关键词：
ascorbic acid; methylene blue; electrocatalysis;
D O I：
10.1081/AL-120018250
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A rapid voltammetric method was developed for the determination Of L-ascorbate using methylene blue as a mediator with a glassy carbon electrode. The magnitude of the peak current that occurs near -0.04V vs. Ag/AgCl is proportional to L-ascorbate concentration in the range of 1.2 x 10(-6) to 1.12 x 10(-3) M. The limit of detection is 1 x 10(-6) M. Eight replicate analyses of 5.0 x 10(-5) M and 4.5 x 10(-4) M L-ascorbate yielded RSD values of 1.9 and 1.6%, respectively. The method was applied to the determination of ascorbic acid in fruit juices and vitamin C tablets.
引用
收藏
页码：591 / 604
页数：14
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