Table of Contents
Chromatography Research International
Volume 2011, Article ID 451712, 8 pages
Research Article

Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Drop Followed by Gas Chromatography-Electron Capture Detector for Determination of Some Pesticides in Water Samples

1Department of Chemistry, Faculty of Sciences, K.N. Toosi University of Technology, Tehran 1969764499, Iran
2Department of Marine Living Resources, Iranian National Institute for Oceanography, Tehran 1411813389, Iran
3Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran

Received 21 June 2011; Revised 24 August 2011; Accepted 5 September 2011

Academic Editor: Kanji Miyabe

Copyright © 2011 Mostafa Bashiri Juybari et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this study dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFO) followed by gas chromatography-electron capture detection (GC-ECD) was developed for determination of some pesticides in the water samples. Some important parameters, such as type and volumes of extraction and disperser solvent and salt effect on the extraction recovery of analytes from aqueous solution were investigated. Under the optimum conditions (extraction solvent: 1-undecanol, 15.0 μL; disperser solvent: acetone, 1.0 mL, and without salt addition), the preconcentration factors were obtained ranged from 802 to 915 for analytes. The linear ranges were from 0.05 to 100 μg L−1, and detection limits ranged from 0.05 to 0.008 μg L−1. The relative standard deviations (RSDs%, 𝑛 = 5 ) were between 3.2% and 6.7%. The proposed method was successfully applied to the determination of target analytes in the tap, sea, and river water samples, and satisfactory recoveries were obtained.