A novel detection approach based on chromophore-decolorizing with free radical and application to photometric determination of copper with acid chrome dark blue

被引：26

作者：

Gao, Hong-Wen

Chen, Fang-Fang

Chen, Ling

Zeng, Teng

Pan, Lu-Ting

Li, Jian-Hua

Luo, Hua-Fei

机构：

[1] Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Shanghai

来源：

ANALYTICA CHIMICA ACTA | 2007年 / 587卷 / 01期

基金：

中国国家自然科学基金;

关键词：

chromophore-decolorizing; hydroxyl radicals; determination of copper; acid chrome dark blue; spectral correction technique; spectrophotometry;

D O I：

10.1016/j.aca.2007.01.046

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A novel detection approach named chromophore-decolorizing with free radicals is developed for determination of trace heavy metal. The hydroxyl radicals (HO center dot) generated from Fe(III) and hydrogen peroxide will oxidize the free chromophore into almost colorless products. The copper-acid chrome dark blue (ACDB) complexation was investigated at pH 5.07. In the presence of Fe(III) and hydrogen peroxide, the excess ACDB was decolorized in the Cu-ACDB reaction solution, and the final solution contained only one color compound, the Cu-ACDB complex. After oxidation of free hydroxyl radicals, the complexation becomes sensitive and selective and it has been used for the quantitation of trace amounts of Cu(II) dissolved in natural water. Beer's law is obeyed in the range from 0 to 0.500 mu g mL(-1) Cu(II) and the limit of detection is only 6 mu g L-1 Cu(II). Besides, the Cu-ACDB complex formed was characterized. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：52 / 59

页数：8

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