Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
46, Number 7, August 2008, pp. 615-621
Analysis of Phenoxyl-Type N-Methylcarbamate
Pesticide Residues in Vegetables by Capillary Zone Electrophoresis
with Pre-Column Hydrolysis and Amperometric Detection
Xucong Lin, Qin Hong, Xiaoping Wu, Liangqia
Guo, and Zenghong Xie
College of Chemistry and Chemical Engineering, Department of
Chemistry, Fuzhou University, Fuzhou 350002, China
With systematic studies of pre-column thermal
hydrolysis, a method is described for the determination of five
phenoxyl-type N-methylcarbamates (NMCs) (viz., propoxur,
carbofuran, 3-hydroxy-carbofuran, carbaryl, and bendiocarb) in
vegetables by capillary zone electrophoresis with amperometric
detection. Effects of hydrolysis parameters such as alkali medium,
temperature, and hydrolysis time, as well as separation conditions,
are investigated. Under the optimum conditions, baseline separation
of five hydrolysates is achieved within 16 min. Good calibration
curves of propoxur, carbofuran, 3-hydroxy-carbofuran, carbaryl,
and bendiocarb are obtained from 1.20 × 10–7 to
5.00 × 10–5
mol/L, and their detection limits (S/N = 3) are 1.80 × 10–8,
1.50 × 10–8, 1.80 × 10–8,
2.50 × 10–8,
and 1.80 × 10–8 mol/L, respectively, which
is approximately 20∼50-fold more sensitive than those previously
reported with a UV method. In the application of vegetable samples,
the five NMCs are well determined. Average recoveries of 75∼89%
and 86∼100%
at fortified levels of 0.05 and 0.80 mg/kg are achieved with
relative standard deviations of 2∼6%, respectively. The method
is sensitive, reproducible, and provides an alternative means
for the analysis of phenoxyl-type NMC pesticide residues.
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