Journal
JOURNAL OF SEPARATION SCIENCE
Volume 35, Issue 18, Pages 2469-2475Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201100978
Keywords
Alkaline water; Back extraction; Chlorophenols; Dispersive liquid-liquid microextraction; Microwave-assisted extraction
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A new method was applied for extraction of five chlorophenols from soil and marine sediment samples. Microwave-assisted extraction coupled with dispersive liquidliquid microextraction followed by semi-automated in-syringe back-extraction technique was used as an extraction technique. Microwave-assisted extraction was performed by using 2.0 mL of alkaline water at pH 10.0. After extraction, the pH of extraction solution was adjusted at 6.0 and dispersive liquidliquid microextraction procedure was done using 1.0 mL of acetone as a disperser solvent and 37.0 mu L of chlorobenzene as extraction solvent. About 20.0 +/- 0.5 mu L sedimented phase was collected after centrifugation step. Then, chlorophenols were back extracted into 20 mu L of alkaline water at pH 12.0 within the microsyringe. Finally, 20.0 mu L of aqueous solution was injected into high performance liquid chromatography with ultra violet detection for analysis. The obtained recovery and preconcentration factors for the analytes were in the range of 68.082.0% and 2530, respectively, with relative standard deviations <= 7.6%. The limits of the detection were found in the range of 0.00050.002 mg/kg. The method provides a simple and fast procedure for the extraction and determination of chlorophenols in soil and marine sediment samples.
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