FLOW-INJECTION SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC-ACID BY REDUCTION OF VANADOTUNGSTOPHOSPHORIC ACID

被引：11

作者：

BURNS, DT ^{[1
]}

CHIMPALEE, N ^{[1
]}

CHIMPALEE, D ^{[1
]}

RATTANARIDEROM, S ^{[1
]}

机构：

[1] SILPAKORN UNIV,FAC SCI,DEPT CHEM,NAKHON PATHOM 73000,THAILAND

来源：

ANALYTICA CHIMICA ACTA | 1991年 / 243卷 / 02期

关键词：

SPECTROPHOTOMETRY; FLOW SYSTEM; ASCORBIC ACID;

D O I：

10.1016/S0003-2670(00)82559-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Ascorbic acid may be determined spectrophotometrically at 360 nm based on reduction of vanadotungstophosphoric acid using flow-injection analysis. The carrier stream was distilled water and the reagent streams were buffer solution (pH 3.0), 1.735 x 10(-3) M dodecatungstophosphoric acid and 1.735 x 10(-3) M sodium vanadate. The injection rate was 80 h-1. The calibration graph was linear up to 80-mu-g ml-1 ascorbic acid and the relative standard deviation for the determination of 20-mu-g ml-1 ascorbic acid was 1.5% (n = 10). The detection limit was 1.0-mu-g ml-1 ascorbic acid, based on an injection volume of 250-mu-l. The system was applied to the determination of ascorbic acid in vitamin C tablets.

引用

页码：187 / 190

页数：4

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