Determination of four kinds of carbamate pesticides by capillary zone electrophoresis with amperometric detection at a polyamide-modified carbon paste electrode

被引:57
作者
Cheng, Xi [1 ]
Wang, Qingjiang [1 ]
Zhang, Shan [1 ]
Zhang, Weidong [1 ]
He, Pingang [1 ]
Fang, Yuzhi [1 ]
机构
[1] E China Normal Univ, Dept Chem, Shanghai 200062, Peoples R China
关键词
capillary zone electrophoresis; amperometric detection; polyamide-modified carbon paste electrode; carbamate pesticides;
D O I
10.1016/j.talanta.2006.06.001
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this paper, a polyamide-modified carbon paste electrode in capillary zone electrophoresis with amperometric detection (CZE-AD) was firstly applied to the determination of four carbamate pesticides: fenobucarb, isoprocarb, metolcarb and carbaryl. The four carbamates were hydrolyzed in alkalescent aqueous solutions, resulting in the formation of 2-sec-butyl phenol, 2-isopropylphenol, m-cresol and alpha-naphthol, which could be determined by amperometry after capillary electrophoretic separation. Under the selected optimum conditions, the four analytes could be perfectly separated within 23 min. The linear ranges of 2-sec-butylphenol, 2-isopropylphenol and m-cresol were from 1.0 x 10(7) to 2.0 x 10(-5) mol L-1 and that of alpha-naphthol was from 2.0 x 10(-7) to 2.0 x 10(-5) mol L-1 and their detection limits were 3.0 x 10(-8), 3.0 x 10(-8), 3.0 x 10(-8) and 6.0 x 10(-8) mol L-1, respectively (S/N = 3). Fenobucarb, isoprocarb, metolcarb and carbaryl can be indirectly determined by this CZE-AD method with recovery of 105, 104, 110 and 98% and R.S.D. of 4, 3, 4 and 3%, respectively. Above results demonstrated that this method was of high sensitivity, good repeatability and could be used in the rapid determination of the pesticide residues. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1083 / 1087
页数:5
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