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Titel (primär) Determination of oil–water partition coefficients of polar compounds: silicone membrane equilibrator vs. SPME passive sampler
Autor Oemisch, L.; Goss, K.-U.; Endo, S.;
Journal / Serie Analytical and Bioanalytical Chemistry
Erscheinungsjahr 2013
Department AUC;
Band/Volume 405
Heft 8
Sprache englisch;
POF III (gesamt) T42;
Supplements https://static-content.springer.com/esm/art%3A10.1007%2Fs00216-012-6689-9/MediaObjects/216_2012_6689_MOESM1_ESM.pdf
Keywords Lipophilicity; Bioaccumulation; Solid-phase microextraction; Passive sampling; Polar compounds; Pesticides
UFZ Querschnittsthemen RU3;
Abstract Experimental determination of oil-water partition coefficients often poses difficulties associated with emulsion formation. The aim of this work was to find an appropriate technique for determination of oil–water partition coefficients of polar, nonvolatile compounds. Two different methods were tested. The first method used a “silicone membrane equilibrator.” For the second method, solid-phase microextraction (SPME) fibers with a polyacrylate (PA) coating were used as a passive sampler. With both methods, oil–water partition coefficients for 14 compounds with polar functional groups were determined at 37 °C with good repeatability (standard deviation 0.11 log units or lower). The partition coefficients determined with the silicone membrane equilibrator method ranged from 0.50 to 3.49 log units. The oil–water partition coefficients obtained with the PA-SPME passive sampling approach were significantly higher than those obtained with the silicone membrane equilibrator method for nine of 14 compounds. The differences were up to 0.39 log units (i.e., a factor of 2.5). Additional experiments suggested that this difference occurred because the sorption properties of the PA fibers used were influenced by the surrounding phase, e.g., through swelling of the polymer phase. Therefore, the SPME passive sampling method using PA fibers seems to be less reliable, whereas the silicone membrane equilibrator method was found to be a convenient technique for the determination of oil–water partitioning.
ID 13548
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=13548
Oemisch, L., Goss, K.-U., Endo, S. (2013):
Determination of oil–water partition coefficients of polar compounds: silicone membrane equilibrator vs. SPME passive sampler
Anal. Bioanal. Chem. 405 (8), 2567 - 2574