Highly selective flow-injection spectrophotometric determination of ascorbic acid in fruit juices and pharmaceuticals using pyrogallol red-iodate system

被引：10

作者：

Ensafi, AA ^{[1
]}

Rezaei, B ^{[1
]}

Beglari, M ^{[1
]}

机构：

[1] Isfahan Univ Technol, Coll Chem, Esfahan, Iran

来源：

ANALYTICAL LETTERS | 2002年 / 35卷 / 05期

关键词：

ascorbic acid; FIA; iodate; pyrogallol red; spectrophotometry;

D O I：

10.1081/AL-120004078

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Ascorbic acid present in pharmaceuticals and fruit juice was rapidly determined by the spectrophotometric method in association with flow injection analysis. The method is based on the inhibitory effect of ascorbic acid on the oxidation of pyrogallol red by iodate in sulfuric acid media. The calibration graph is linear in the range of 2.0 x 10(-6) M up to 1.0 x 10(-4) M. The throughput is 20 x 5 samples per hour and the detection limit is 0.5 muM ascorbic acid. The relative standard deviation for ten replicate determinations of 8.00 muM and 50.0 muM ascorbic acid is 3.4 and 0.60%, respectively. The influence of various species was studied for this determination.

引用

页码：909 / 920

页数：12

共 23 条

[1] Direct chemiluminescence determination of ascorbic acid using flow injection analysis [J].