Extraction of Pesticides from Aqueous Samples: a Comparative Study
- Barrio, C.S. 1
- Melgosa, E.R. 1
- Asensio, J.S. 1
- Bernal, J.G. 2
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1
Universidad de La Rioja
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2
Universidad de Zaragoza
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ISSN: 0026-3672
Year of publication: 1996
Volume: 122
Issue: 3
Pages: 267-277
Type: Article
More publications in: Mikrochimica acta
Abstract
Three different extraction procedures for eight pesticides (chlorfenvinphos, diazinon, ethyl parathion, ethiofencarb, fenitrothion, malathion, metalaxyl, pirimicarb) in water samples are compared. The extraction procedures are: liquid-liquid extraction (LLE), solid phase extraction (SPE) and microextraction (ME). For each procedure the most suitable conditions were obtained experimentally, with special remarks on ME, in which the effects of different mixtures of Kaltron with other solvents were tested. A preconcentration factor (PF) was used to rank the methods; the best results were observed for ME, (PF 15-45, whereas PF < 10 for SPE, and PF ≤ 13 for LLE). In all cases, the determination was performed by gas chromatography, using a nitrogen phosphorus detector and the internal standard method (methyl parathion) as the quantification procedure.