期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1062, 期 1, 页码 15-21出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.11.026
关键词
headspace liquid-phase microextraction; extraction method; food analysis; 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 were extracted using 0.8 mul 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 mug/l within an extraction time of similar to9.5 min under GC-MS in full scan mode. (C) 2004 Elsevier B.V. All rights reserved.
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