The application of solid phase microextraction in the analysis of organophosphorus pesticides in a food plant

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)3816-3820
Journal / PublicationEnvironmental Science and Technology
Volume32
Issue number23
Publication statusPublished - 1 Dec 1998

Abstract

A SPME method for the determination of organophosphorus pesticide residues in a local food plant, Chrysanthemum coronarium, was established. Pesticide residues were extracted by SPME fiber (with 100 μm poly(dimethylsiloxane) coating) from a biphasic water/plant tissues mixture and determined by GC-FPD. An equilibrium model was derived for the system and revealed that pesticide recoveries were related to the water:plant tissues ratio, f, and the partition coefficient, K(WV), for the distribution of pesticides between the aqueous phase and the plant tissues. The model was verified by four organophosphorus pesticides, namely phorate, diazinon, methyl parathion, and ethion. The best fitted K(WV) values (P-2 (phorate); 1.11 ± 0.10 x 10-1 (diazinon); 9.18 ± 0.95 x 10-2 (methyl parathion); and 8.21 ± 1.28 x 10-3 (ethion). Remarkable correlation between the K(WV) of the organophosphorus pesticides and their octanol/water partition coefficients, K(OW), was also established.