Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1209, Issue 1-2, Pages 76-82Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2008.09.030
Keywords
Ionic liquids; Headspace single drop microextraction; Gas chromatography; Mass spectrometry; Trihalomethanes; Waters
Funding
- Spanish DGICyT [CTQ2007-60426]
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A simple, rapid. solventless method for the determination of trihalomethanes (THMs) (chloroform, bromodichloromethane, dibromochloromethane and bromoform) in water samples is presented. The analytes are extracted from the headspace of the aqueous matrix into a 2 mu L drop of the ionic liquid 1-octyl-3-methyl-imidazolium hexafluorophosphate working at 30 degrees C for 30 min. The separation and detection of the target compounds is accomplished by gas chromatography/mass spectrometry owing to the use of an interface that efficiently transfers the analytes extracted in the ionic liquid drop to the gas chromatograph while preventing the ionic liquid from entering the column. The detection limits obtained are below the values compelled by the legislation, ranging from 0.5 mu g L-1 for chloroform and bromodichloromethane to 0.9 mu g L-1 for dibromochloromethane. The use of ionic liquid in the extraction procedure avoids the use of organic solvents and leads to relative standard deviations that range from 3.1% to 4.8%. (C) 2008 Elsevier B.V. All rights reserved.
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