4.6 Article

Combination of microwave assisted micellar extraction and liquid chromatography for the determination of organophosphorous pesticides in soil samples

Journal

JOURNAL OF CHROMATOGRAPHY A
Volume 1078, Issue 1-2, Pages 13-21

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ELSEVIER
DOI: 10.1016/j.chroma.2005.05.005

Keywords

organophosphorous pesticides; surfactants; microwave assisted micellar extraction; HPLC-UV

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A new methodology based on the microwave assisted micellar extraction (MAME) technique has been optimised, using soil samples, to extract and determine a mixture of the eight organophosphorous pesticides mainly used in agriculture. The pesticides under study have been extracted using the non-ionic surfactants polyoxyethylene 10 lauryl ether (POLE) and oligoethylene glycol monoalkyl ether (Genapol X-080). The optimal extraction variables, such as surfactant concentration, pH, radiation time and microwave power were determined for each surfactant. The results show the advantage of using POLE instead of Genapol X-080 for the extraction of the organophosphorus pesticides with recoveries higher than 70% for most of the compounds and relative standard deviations (RSD) below 2.6%. This method was successfully applied to fresh samples as well as to aged samples for the analysis of soils with different characteristics and compared with the traditional Soxhlet technique. (c) 2005 Elsevier B.V. All fights reserved.

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