Comparison of supercritical fluid extraction and liquid-liquid extraction for isolation of selected pesticides stored in freeze-dried water samples |
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Authors: | R. Alzaga G. Durand D. Barceló J. M. Bayona |
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Affiliation: | (1) Environmental Chemistry Department., CID-CSIC, c/Jordi Girona 18-26, 08034 Barcelona, Spain;(2) Present address: Cellule Environment, Communauté Urbaine de Brest, Brést, France |
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Abstract: | Summary The stability of freeze-dried water samples spiked with eight agrochemicals (atrazine, simazine, linuron, carbaryl, propanil, fenitrothion, parathion and fenamiphos) were examined to evaluate their suitability as candidate reference materials for their determination in water samples. In addition, two different extraction procedures, liquid-liquid and supercritical fluid extraction, were compared for the isolation and trace enrichment of target analytes from freeze-dried water samples. Final analytical determinations were by gas chromatography-nitrogen phosphorus detection and electronic impact mass spectrometry, and by liquid chromatography-diode array detection. The whole methodology developed in this paper permitted the determination of pesticides spiked in water at levels varying from 0.03 to 6.9 g L–1. |
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Keywords: | Gas chromatography Liquid-liquid extraction Supercritical fluid extraction Pesticides Freeze-dried water |
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