Tadesse B., Teju E., Gure A., Megersa N.
Department of Chemistry, College of Natural Sciences, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia; Department of Chemistry, College of Science, Engineering and Technology, University of South Africa, Pretoria, South Africa; Department of Chemistry, College of Natural Sciences, Jimma University, P. O. Box 378, Jimma, Ethiopia
Tadesse, B., Department of Chemistry, College of Natural Sciences, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia, Department of Chemistry, College of Science, Engineering and Technology, University of South Africa, Pretoria, South Africa; Teju, E., Department of Chemistry, College of Natural Sciences, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia; Gure, A., Department of Chemistry, College of Natural Sciences, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia, Department of Chemistry, College of Natural Sciences, Jimma University, P. O. Box 378, Jimma, Ethiopia; Megersa, N., Department of Chemistry, College of Natural Sciences, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia
Ionic-liquid-based dispersive liquid-liquid microextraction in combination with highperformance liquid chromatography and diode array detection has been proposed for the simultaneous analysis of four multiclass pesticide residues including carbaryl,methidathion, chlorothalonil, and ametryn from water samples. The major experimental parameters including the type and volume of ionic liquid, sample pH, type, and volume of disperser solvent and cooling time were investigated and optimum conditions were established. Under the optimum experimental conditions, limits of detection and quantification of the method were in the range of 0.1-1.8 and 0.4-5.9 μg/L, respectively, with satisfactory enrichment factors ranging from 10-20. The matrix-matched calibration curves, which were constructed for lake water, as a representative matrix were linear over wide range with coefficients of determination of 0.996 or better. Intra- and interday precisions, expressed as relative standard deviations, were in the range of 1.1-9.7 and 3.1-7.8%, respectively. The relative recoveries of the spiked environmental water samples at one concentration level were in the range of 77-102%. The results of the present study revealed that the proposed method is simple, fast, and uses environmentally friendly extraction solvent for the analysis of the target pesticide residues in environmental water samples. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Chromatography; High performance liquid chromatography; Ionic liquids; Liquid chromatography; Liquids; Pesticides; Solvent extraction; Dispersive liquid-liquid microextraction; Environmental water; Environmental water samples; Experimental conditions; Experimental parameters; Pesticide residue; Relative standard deviations; Simultaneous analysis; Extraction; ionic liquid; lake water; pesticide residue; analytic method; Article; dispersion; high performance liquid chromatography; limit of detection; liquid phase microextraction; pH; priority journal; water analysis; water contamination