Flow injection spectrophotometric or conductometric determination of ascorbic acid in a vitamin C tablet using permanganate or ammonia

被引：56

作者：

Grudpan, K ^{[1
]}

Kamfoo, K ^{[1
]}

Jakmunee, J ^{[1
]}

机构：

[1] Chiang Mai Univ, Fac Sci, Dept Chem, Chiang Mai 50200, Thailand

来源：

TALANTA | 1999年 / 49卷 / 05期

关键词：

ascorbic acid; vitamin C; flow injection; spectrophotometry; conductometry; permanganate; ammonia;

D O I：

10.1016/S0039-9140(99)00047-8

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Two simple flow injection (FI) procedures for the determination of ascorbic acid content in a vitamin C tablet are proposed: spectrophotometric involving injection into a stream of acidic potassium permanganate solution and monitoring its color change due to the redox reaction; Fl conductometry based on the neutralization of ascorbic acid injected into a flowing ammonia solution yielding a change in conductivity. The procedures have been applied to the analysis of locally commercial vitamin C tablet samples. A through-put of at least 90 injections h(-1) can be achieved. The relative standard deviation was found to be 2.5% (for a 50 mg vitamin C tablet; n = 7) for both. Results obtained by either procedure agree with a standard titrimetric method. (C) 1999 Elsevier Science B.V. All rights reserved.

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收藏

页码：1023 / 1026

页数：4

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