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Solid phase microextraction applied to the analysis of organophosphorus insecticides in fruits |
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| Authors: | Fytianos K Raikos N Theodoridis G Velinova Z Tsoukali H |
| Institution: | aEnvironmental Pollution Control Laboratory, Chemistry Department, University of Thessaloniki, 541 24 Thessaloniki, Greece bLaboratory of Legal Medicine and Toxicology, Faculty of Medicine, University of Thessaloniki, 541 24 Thessaloniki, Greece cAnalytical Chemistry Laboratory, Chemistry Department, University of Thessaloniki, 541 24 Thessaloniki, Greece |
| Abstract: | Trace amounts of organophosphorus pesticides (OPs) were determined in various fruits by headspace solid phase microextraction (HS-SPME) and gas chromatography–nitrogen phosphorous detection (GC-NPD). Sampling from the headspace enhanced method selectivity, whereas at the same time improved fiber life time and method sensitivity. Diazinon, parathion, methyl parathion, malathion and fenithrothion were determined in various fruits: more than 150 samples of 21 types of fruits were studied. SPME-GC-NPD provided a useful and very efficient analytical tool: method linearity ranged from 1.2 to 700 ng/ml. Limits of detection (LODs) and quantitation (LOQs) ranged from 0.03 to 3 ng/ml and 0.12 to 10 ng/ml respectively, values well below the residue limits set by the EU. Less than 2% of the samples were found positive containing amounts higher than the EU limits. The effect of fruit peeling and washing was also investigated. |
| Keywords: | Fruit analysis Organophosphorus OP insecticides SPME Gas chromatography |
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