| Abstract
| - A method based on a headspace solid phase microextraction (HS-SPME) technique followed by gaschromatography with flame thermionic and mass spectrometric detection was developed for thedetermination of seven organophosphorus (OPs) insecticide residues in strawberry and cherry juicesamples. The extraction capacities of four fiber coatings, polyacrylate (PA 85 μm), poly(dimethylsiloxane) (PDMS 100 μm), carbowax−divinylbenzene (CW−DVB 65 μm), and poly(dimethylsiloxane)−divinylbenzene (PDMS−DVB 65 μm), have been studied and compared. The method was developedusing spiked strawberry and cherry juices in a concentration range of 0.5−50 μg/L. The PDMS 100μm fiber showed good extraction efficiency for the target compounds. An increase in the extractionefficiency of OP insecticides was observed when the parameters affecting the HS-SPME processsuch as temperature, extraction time, salt additives, stirring rate, pH, and effect of dilution wereoptimized. Good linearity of compounds was observed in the tested concentration range. The relativestandard deviations were found to be <20%. The limits of detection were between 0.025 and 0.050μg/L. The mean relative recoveries ranged from 82 to 102%. Keywords: Fruit juice analysis; OP insecticides; HS-SPME; gas chromatography
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