Determination of organophosphorous pesticides in water samples using dynamic liquid-phase microextraction and gas chromatography
A novel method for the determination of five organophosphorous pesticides ( dichlorvos, diazinon, chlorpyrifos, parathion methyl and parathion) in water samples has been developed using liquid-phase microextraction and gas chromatography. The results showed that toluene was a suitable extraction solvent and when the volume of toluene was 2 mu L the extroution. was optimum. Since liquid phase microextraction (LPME) is an unbalance extraction procedure, the extraction efficiency was enhanced as the extraction frequency increased, in this study the extraction frequency was 25. The concentration factors for various analyte were between 21. 4 and 59. 5, relative standard deviations of matrix spiked samples ranged from 4. 9% to 8. 0%. Recoveries of the analytes were 0. 85 % similar to 2. 38 %. The detection limits were in the range of 0. 1 similar to 0. 3 mu g/L.