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

• Published in: Journal of Chromatography A Vol. 999; no. 1; pp. 35 - 42
• Main Authors: Paschke, A., Popp, P.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30-05-2003; Elsevier
• 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; Polynuclear aromatic hydrocarbons; Organochlorine compounds; Pesticides; Solid-phase microextraction; Polychlorinated biphenyls; Fibre–water distribution constants; Octanol–water partition coefficients; Chlorobenzenes; Water; Fibre-water distribution constants; DDE; Chromatographic retention; Octanol; Lipophily; Partition coefficient; Octanol-water partition coefficients; Ethylene oxide polymer; Chlorocarbon; Crosslinked polymer; Adsorbent; Siloxane polymer; Dimethylsiloxane polymer; Hydrocarbon; Regression analysis; Polycyclic aromatic compound; Experimental study; HCH; Polychlorobiphenyl; Solid phase microextraction; Pollutant; Acrylate polymer; Correlation analysis
• ISSN: 0021-9673
• DOI: 10.1016/S0021-9673(03)00538-7

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.