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Headspace Solid-Phase Microextraction for the Gas Chromatographic Analysis of Organophosphorus Insecticides in Vegetables

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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 m). 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 Residues of methyl parathion and parathion, which were withdrawn in Greece in 2003, were detected in 36.8 and 4% of all samples, respectively.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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Document Type: Research Article

Affiliations: 1: University of Thessaloniki, Environmental Pollution Control Laboratory, Chemistry Department, 541 24 Thessaloniki, Greece. 2: University of Thessaloniki, Laboratory of Forensic Medicine and Toxicology, Faculty of Medicine, 541 24 Thessaloniki, Greece. 3: University of Thessaloniki, Analytical Chemistry Laboratory, Chemistry Department, 541 24 Thessaloniki, Greece.

Publication date: November 1, 2007

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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