S(IV) induced autoxidation of Cu(II)/tetraglycine complexes in the presence of aldehydes:: mechanistic considerations and analytical applications

被引：17

作者：

Alipázaga, MV ^{[1
]}

Kosminsky, L ^{[1
]}

Coichev, N ^{[1
]}

Bertotti, M ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil

来源：

TALANTA | 2002年 / 57卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

sulfite; Cu(III); tetraglycine; formaldehyde; acetaldehyde; wine; flow injection analysis; amperometric detection;

D O I：

10.1016/S0039-9140(02)00039-5

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An indirect amperometric method for the determination of sulfite in a flow injection configuration is described. The procedure is based on the amperometric measurement (E=0.1 V) of Cu(III) chemically generated by the S(IV) induced oxidation of Cu(II) /tetraglycine by dissolved oxygen. The dynamic analytical range was 5-100 muM with a detection limit of 1 muM. The repeatability for the determination (10 muM) was evaluated to be 1.4% (n = 20). The method was employed for the determination of S(IV) in wine after its extraction from acidified samples by bubbling argon and the results were in agreement with those obtained by the iodometric procedure. The influence of formaldehyde and acetaldehyde on the Cu(III) formation is also discussed on the basis of the mechanism of the induced reaction. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：375 / 381

页数：7

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