Headspace solid-phase microextraction for the gas chromatographic analysis of organophosphorus insecticides in vegetables
2007
Fytianos, K. | Drimaropoulou, G. | Raikos, N. | Theodoridis, G. | Tsoukali, H.
Residues of organophosphorus insecticides (diazinon, methyl parathion, fenitrothion, malathion, and parathion) were determined in 13 different vegetable matrixes by headspace solid-phase microextraction performed with a polydimethyl-siloxane fiber (100 micrometer). Determination was carried out by gas chromatography with a nitrogen-phosphorus detector. Limits of detection and quantification were <0.005 and 0.017 mg/kg, respectively; thus, the limits of maximum residue levels (MRLs) required by European regulations can be verified without difficulty. Pesticide residues were found in 38% of the 125 fresh commercial samples (imported and domestic) that were analyzed. Residues of methyl parathion and parathion, which were withdrawn in Greece in 2003, were detected in 36.8 and 4% of all samples, respectively. The MRLs were exceeded overall by 1%.
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