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 (Kfw) of more hydrophobic chemicals were determined with six different solid-phase microextraction fibre types (including a polyoctylmethylsiloxane (C8) prototype) by fibre exposure to agitated large-volume water samples lasting several days. The results obtained are comparable with Kfw values obtained under dynamic conditions. Octanol-water partition coefficients (Kow) were measured with the mixture of distributing substances to examine log Kfw-log Kow relationships based on a consistent dataset. Kfw 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 microm polydimethylsiloxane (PDMS)>100 microm PDMS>C8>polyacrylate) whereas this is not the case with the PDMS-divinylbenzene (DVB) and Carbowax-DVB fibres, partially porous coatings which provide the highest Kfw values for all substances tested.
Paschke
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Department of Chemical Ecotoxicology, UFZ-Centre for Environmental Research, Pennmoserstrasse 15, 04318 Leipzig, Germany. apa@uoe.ufz.de
Popp
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D000442:Octanols / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis*; D012680:Sensitivity and Specificity; D014867:Water / Q000737:chemistry*
D000442:Octanols; D009930:Organic Chemicals; D014867:Water