Solid-phase microextraction fibre–water distribution constants of more hydrophobic organic compounds and their correlations with octanol–water partition coefficients

Fibre coating–water distribution constants ( K fw) of more hydrophobic chemicals were determined with six different solid-phase microextraction fibre types (including a polyoctylmethylsiloxane (C 8) prototype) by fibre exposure to agitated large-volume water samples lasting several days. The results...

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Bibliographic Details
Published in:Journal of Chromatography A 2003-05, Vol.999 (1), p.35-42
Main Authors: Paschke, A., Popp, P.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chlorobenzenes
Chromatographic methods and physical methods associated with chromatography
Exact sciences and technology
Octanols - chemistry
Organic Chemicals - analysis
Organochlorine compounds
Other chromatographic methods
Pesticides
Polychlorinated biphenyls
Polynuclear aromatic hydrocarbons
Sensitivity and Specificity
Water - chemistry
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Summary:Fibre coating–water distribution constants ( K fw) of more hydrophobic chemicals were determined with six different solid-phase microextraction fibre types (including a polyoctylmethylsiloxane (C 8) prototype) by fibre exposure to agitated large-volume water samples lasting several days. The results obtained are comparable with K fw values obtained under dynamic conditions. Octanol–water partition coefficients ( K ow) were measured with the mixture of distributing substances to examine log K fw–log K ow relationships based on a consistent dataset. K fw values obtained with liquid polymer fibre coatings correlate reasonably well with the hydrophobicity of the test compounds (with decreasing sensitivity in the following order: 7 μm polydimethylsiloxane (PDMS)>100 μm PDMS>C 8>polyacrylate) whereas this is not the case with the PDMS–divinylbenzene (DVB) and Carbowax–DVB fibres, partially porous coatings which provide the highest K fw values for all substances tested.
ISSN:0021-9673
DOI:10.1016/S0021-9673(03)00538-7