Journal
MICROCHEMICAL JOURNAL
Volume 83, Issue 2, Pages 105-110Publisher
ELSEVIER
DOI: 10.1016/j.microc.2006.03.008
Keywords
water analysis; GC-mu ECD; single-drop microextraction; herbicides
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In this article, a new method using single-drop microextraction (SDME) and gas chromatography micro-electron capture detection (GC-mu ECD) for the determination of chloroacetanilide herbicides (alachlor, acetochlor, metolachlor, pretilachlor and butachlor) residues was developed. The effects of SDME parameters such as extraction solvent, stirring rate, ionic strength, microdrop volume and extraction time were optimized. The optimum experimental conditions found were: 1.6 mu l toluene microdrop, 5 ml water sample, 400 rpm stirring rate, 15 min extraction time and no salt addition. Analytical parameters such as linearity, repeatability and limit of detection were also evaluated. The proposed method was proved to be a simple and rapid analytical procedure for chloroacetanilide herbicides in water with limits of detection 0.0002-0.114 mu g/l. The relative recoveries range from 80% to 102% for all the target analytes, with the relative standard deviations varying from 3.9% to 11.7%. (c) 2006 Elsevier B.V. All rights reserved.
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