Development of Dispersive Liquid-Liquid Microextraction method combined with UV spectrophotometry for the Determination of Malathion Pesticide

Abstract

A simple and novel method was developed by combination of dispersive liquid-liquid microextractionwith UV spectrophotometry for the preconcentartion and determination of trace amountof malathion. The presented method is based on using a small volume of ethylenechloride as theextraction solvent was dissolved in ethanol as the dispersive solvent, then the binary solution wasrapidly injected by a syringe into the water sample containing malathion. The important parameters,such the type and volume of extraction solvent and disperser solvent, the effect of extractiontime and rate, the effect of salt addition and reaction conditions were studied. At the optimumconditions, the calibration graph was linear in the range of 2-100 ng mL-1 of malathion with alimit of detection of 0.8 ng L-1. In addition, the enrichment factor was 30. The developed methodwas successfully applied for the determination of malathion pesticide in water samples.