Apparent octanol/water partition coefficients of pentachlorophenol as a function of pH

Abstract

The apparent 1-octanol/water partition coefficient (log P App ) of pentachlorophenol (PCP) varies in non-linear function with pH of the aqueous solution. In the range of pH 1.2 to 13.5 extreme values of log P App 4.84 at pH 1.2 and log P App 1.3 at pH 10.5 were observed. In the alkaline regime, log P App increases strongly with the ionic strength. The ion-corrected partition coefficient of PCP was found to be log P 5.05 in good agreement with literature values.