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標題: Purge-assisted headspace solid-phase microextraction combined with gas chromatography-mass spectrometry for determination of chlorophenols in aqueous samples
作者: Ho, H.P.
Lee, R.J.
Lee, M.R.
關鍵字: Purge-assisted headspace solid-phase;microextraction;Chlorophenols;Gas chromatography-mass spectrometry;Aqueous samples;liquid-liquid microextraction;environmental-samples;water samples;extraction;derivatization;hydrocarbons;validation;serum;gc/ms;spme
Project: Journal of Chromatography A
期刊/報告no:: Journal of Chromatography A, Volume 1213, Issue 2, Page(s) 245-248.
A simple, economical and very effective method is demonstrated for simultaneous determination of 2,4-dichlorophenol, 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol and pentachlorophenol, in aqueous samples, by using purge-assisted headspace solid-phase microextraction (PA/HS-SPME) coupled to gas chromatography-mass spectrometry (CC-MS). In the new method, purging the sample enhances the removal of the trace chlorophenols without derivatization from the matrices to the headspace. Extraction parameters including extraction temperature, purge gas How rate and extraction time were systematically investigated. Under optimal conditions, the relative standard deviations (RSDs) were 4-11% at 50 pg/mL and 5-14% at 5 pg/mL. respectively. The recoveries were in the range of 83-114%. Detection limits were determined at the fg level. These results indicate that PA/HS-SPME provides a significant contribution to highly efficient extraction of semi-volatile CPs. especially for pentachlorophenol, which has the smallest Henry's constant and large octanol-water partitioning coefficient. In addition, the proposed method was successfully applied to the analysis of chlorophenols in landfill leachate. New perspectives are opened for headspace extraction of relatively low vapor pressure compounds in complex matrices. (c) 2008 Elsevier B.V. All rights reserved.
ISSN: 0021-9673
DOI: 10.1016/j.chroma.2008.10.056
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