Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1218, Issue 7, Pages 869-874Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2010.12.075
Keywords
Liquid phase microextraction; Stir membrane extraction; Membranes; Chlorophenols; Water
Funding
- Spanish Ministry of Science and Innovation [CTQ2007-60426]
- [AP2006-03573]
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In this article, a novel liquid phase microextraction technique, called stir membrane liquid-liquid microextraction (SM-LLME), is presented. The new approach combines the advantages of liquid phase microextraction and stirring in the same unit allowing the isolation and preconcentration of the analytes in a simple and efficient way. In the construction of the unit, a polymeric membrane is employed to protect the small volume of the extractant phase. The extraction technique is characterized for the resolution of a model analytical problem: the determination of five selected chlorophenols in water. A two-phase extraction mode is used for the extraction of the analytes with an organic solvent in which an in situ derivatization reaction takes place. The analytes are finally analyzed by gas chromatography/mass spectrometry. All the variables involved in the extraction process have been clearly identified and optimized. The new extraction mode allows the determination of chlorophenols with limits of detection in the range from 14.8 ng/L (for 2,4,5-trichlorophenol) to 22.9 ng/L (for 3-chlorophenol) with a relative standard deviation lower than 8.7% (for 2,6-dichlorophenol). (C) 2010 Elsevier B.V. All rights reserved.
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