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Application of reverse miniaturized dispersive liquid–liquidextraction method for determination of organophosphorus pesticides in water samples by GC/MS

Jalal Hassan, Hossein Rahmani Shams, Abdol Mohammad Attaran

In this work, the application of reverse miniaturized dispersive liquid– liquid extraction techniques for determination of some organophosphorus pesticides (OPPs) in water samples has been evaluated. Reverse miniaturized dispersive liquid–liquid extraction method based on extraction with methanol containing buthyl acetate as a solvent was added sample and after phase separation, buthyl acetate injected to the GC/MS instrument. Gas chromatography/Mass spectrometry (GC/MS) in selected ion storage mode (SIS) was employed for the identification and quantification of diazinon, chlorpyrifos and butachlor. Important parameters affecting both extraction and reverse miniaturized dispersive liquid–liquid extraction procedures were investigated and optimized. Analytical method provides enrichment factors in the range of 11-18 for these pesticides. The calibration plotswere linear in the ranges 0.06–15.0 ng mL”1, 0.1-15.0 ngmL-1 and 0.4- 15.0 ng mL”1 and limit of detection was 0.02, 0.03 and 0.14 ng mL”1 for diazinon, chlorpyrifos and butachlor, respectively. The developed method was able to detect trace amounts of these pesticides in the water samples.