Determination Polar Pesticides in Water Samples Using Acetonitril/Butylacetate Dispersive Solvent Extraction Combined with Gc-Ms Determination

In this study, a simple, rapid and green sample preparation method has been developed for the extraction and preconcentration of polar pesticides in aqueous samples. In this proposed extraction procedure, an aqueous sample solution was added to a mixture of butyl acetate-acetonitril, was shake and was separated into two layers. The upper layer (butyl acetate) was collected and analyzed by GC/MS. No centrifugation was required in this procedure. Important parameters influencing the extraction process including type and volume of extraction solvent and co-solvent, and ionic strength were optimized. Under optimal conditions, the proposed method provided high extraction efficiency, good linearity range (0.7?50 ng mL-1), low limits of detection (0.005?0.2 ng mL-1) and good repeatability and recoveries. The relative standard deviations (RSDs, n = 5) were in the range of 2-9%. Finally, the proposed method was successfully applied to OPPs determination in water samples.