Dynamic headspace liquid-phase microextraction of alcohols

A method was developed using dynamic headspace liquid-phase microextraction and gas chromatography-mass spectrometry for extraction and determination of 9 alcohols from water samples. Four different solvents, hexyl acetate, n-octanol, o-xylene and n-decane were studied as extractants. The analytes w...

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Veröffentlicht in:Journal of Chromatography A 2005-01, Vol.1062 (1), p.15-21
1. Verfasser: Saraji, Mohammad
Format: Artikel
Sprache:eng
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Zusammenfassung:A method was developed using dynamic headspace liquid-phase microextraction and gas chromatography-mass spectrometry for extraction and determination of 9 alcohols from water samples. Four different solvents, hexyl acetate, n-octanol, o-xylene and n-decane were studied as extractants. The analytes were extracted using 0.8 μl of n-octanol from the headspace of a 2 ml sample solution. The effect of sampling volume, solvent volume, sample temperature, syringe plunger withdrawal rate and ionic strength of the solution on the extraction performance were studied. A semiautomated system including a variable speed stirring motor was used to ensure a uniform movement of syringe plunger through the barrel. The method provided a fairly good precision for all compounds (5.5–9.3%), except methanol (16.4%). Detection limits were found to be between 1 and 97 μg/l within an extraction time of ∼9.5 min under GC–MS in full scan mode.
ISSN:0021-9673
DOI:10.1016/j.chroma.2004.11.026