title: Solid-phase microextraction fibre-water distribution constants of more hydrophobic organic compounds and their correlations with octanol-water partition coefficients.
abstract: 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.
authors.affiliation: Department of Chemical Ecotoxicology, UFZ-Centre for Environmental Research, Pennmoserstrasse 15, 04318 Leipzig, Germany. apa@uoe.ufz.de
authors.forename: A
authors.initials: A
authors.lastname: Paschke
authors.forename: P
authors.initials: P
authors.lastname: Popp
mesh_terms: D000442:Octanols / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis*; D012680:Sensitivity and Specificity; D014867:Water / Q000737:chemistry*
chemical_list: D000442:Octanols; D009930:Organic Chemicals; D014867:Water