Abstract
A new preconcentration method termed, homogeneous liquid-liquid microextraction via flotation assistance (HLLME-FA) has been developed for the sensitive determination of Malathion in water samples. In this method, home-designed extraction cell was used for facile collection of organic solvent during the extraction procedure. The novel approach avoids the centrifugation step. In this extraction method, a mixture of toluene (extraction solvent) and acetone (homogeneous solvent) was added into a special vessel after addition of the sample solution. By using air flotation, the organic solvent was collected at the conical part of the designed cell. Parameters affecting the extraction efficiency such as type and volume of extraction and homogeneous solvents, ionic strength and extraction time were studied and optimized. The new method (HLLME-FA) provides detection limit of 0.1 µg L -1 and calibration graph was linear in the range of 1.0 - 200 µg L -1 . The results show that HLLME-FA is a suitable method for the determination of Malathion in water samples. KEY WORDS : Homogeneous liquid-liquid microextraction, Flotation assistance, Malathion, Gas chromatography, Water samples Bull. Chem. Soc. Ethiop. 2019 , 33(1), 1-10 DOI: https://dx.doi.org/10.4314/bcse.v33i1.1
Highlights
Malathion as organophosphorous insecticide was used for the control of insects on fruits and vegetables
Pesticide samples are usually enriched by liquid-liquid extraction[10, 11] or solid-phase extraction [12, 13]
Selection of extraction solvent In HLLME-FA, to facilitate collection of the extraction solvent in the narrow section of the extraction cell, the extraction solvent must have a lower density than water
Summary
Malathion as organophosphorous insecticide was used for the control of insects on fruits and vegetables. Malathion has been used to control mosquitoes, flies, miscellaneous household insects, animal parasites, and human head and body lice [1]. Several studies have been reported on the analysis of OPPs pesticides in aqueous sample [3,4,5,6,7,8,9]. Pesticide samples are usually enriched by liquid-liquid extraction[10, 11] or solid-phase extraction [12, 13]. In view of the aqueous sample, the conventional liquid-liquid extraction (LLE) often needs large amounts of toxic solvent and time-consuming procedure. Solid-phase extraction (SPE) is a less time consuming than LLE and is used in many environmental fields
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