Copper microelectrode as liquid chromatography detector for herbicide glyphosate

被引：13

作者：

Coutinho, Claudia F. B. ^{[1
]}

Coutinho, Lincoln F. M. ^{[1
]}

Mazo, Luiz H. ^{[1
]}

Lancas, Fernando M. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Fis & Quim Sao Carlos, BR-13566 Sao Carlos, SP, Brazil

来源：

ELECTROANALYSIS | 2007年 / 19卷 / 11期

关键词：

copper microelectrode; glyphosate; complexation reaction; coulometric detection; HPLC;

D O I：

10.1002/elan.200603817

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Electrochemical behavior of herbicide glyphosate at copper microelectrode was investigated in alkaline and buffer solutions, and two mechanisms seemed to take place for glyphosate: i) complexation reaction at lower potential in alkaline and buffer solutions and ii) catalysis process at higher potential in alkaline solution. It was demonstrated that the copper microelectrode can be used as coulometric detector for glyphosate in HPLC, using the complexation reaction in buffer solution. Under optimized conditions, the detection limit for glyphosate was 5.9 x 10(-7) mol L-1. The present method was successfully applied to the determination of glyphosate in tomato juice with a recovery of 88%.

引用

页码：1223 / 1226

页数：4

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