Abstract
A simple, efficient and selective sample preparation technique using low density based dispersive liquid-liquid microextraction has been developed for the analysis of nine multiresidue pesticides inculding six sulfonylurea and three organophosphorus pesticides in environmental waters by HPLC-diod array detector. Various experimental parameters affecting the extraction efficiency were investigated. Under the optimum experimental conditions, matrix-matched calibration curves were established in groundwater and good linearities were obtained with coefficient of determination (r2) of 0.990 or better. The limits of detection and quantification were in the ranges 0.8–3.3 and 2.5–11.0 µg/L, at a signal-to-noise ratio of 3 and 10, respectively. The relative standard deviations of the precision studies were varied over the range of 0.2–13%. The proposed method was successfully applied to selective extraction of the target pesticide residues in different environmental waters and acceptable recoveries, in the range 81–121%, were obtained.
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