Methods to Determine Partition Coefficient of Organic Compounds in Water/Polystyrene Systems

Three experimental techniques were employed to determine the partition coefficient (K) of toluene, d-limonene, and ethyl acetate between water and polystyrene. These techniques were gas chromatography, (GC) gel permeation chromatography (a novel approach), and a dynamic thermal stripping-thermal desorption procedure. Comparative results of K values, range of applicability and the limitations of each technique were determined. GC was very suitable for systems showing high K values, while gel permeation chromatography was excellent for direct measurement of sorbed compounds. Statistical analysis of results and kinetics of the sorption process were included. Values of K were 800 for toluene, 5100 for d-limonene and 1.9 for ethyl acetate.