title: Octanol:water partition coefficients (P): measurement, estimation, and interpretation, particularly for chemicals with P greater than 10(5).
abstract: Methods for measurement and estimation of octanol:water partition coefficients are discussed with particular reference to high values (log P greater than 5). A novel experimental method for P measurement is described and preliminary results presented. The use of high performance liquid chromatography capacity factors for estimating P values has been investigated; better correlations between the two parameters have been found if HPLC results at different methanol:water liquid phases are extrapolated to pure water, but even this procedure does not always give reliable P values. The interpretation of high log P values in terms of fish bioconcentration is discussed and the correlations of molecular connectivity and molecular weight with fish bioconcentration are presented.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D005399:Fishes / Q000378:metabolism; D008970:Molecular Weight; D000442:Octanols / Q000032:analysis*; D012995:Solubility; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D000442:Octanols; D014874:Water Pollutants, Chemical; D014867:Water