HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHIC MEASUREMENT OF THE 1-OCTANOL-WATER PARTITION-COEFFICIENT OF S-TRIAZINE HERBICIDES AND SOME OF THEIRDEGRADATION PRODUCTS

1-Octanol-water partition coefficients (K-ow) of s-triazines and some of their degradation products were determined using two reversed-phase high-performance liquid chromatography (HPLC) methods. In the first m ethod, an octadecyl column was coated with 1-octanol and eluted with 1 -octanol-saturated water. Using this method, a maximum log K-ow of 2.8 6 could be determined. For higher values a recently developed gradient HPLC method was used. The determined 1-octanol-water partition coeffi cients are helpful for studies and mathematical models dealing with th e fate of s-triazine herbicides and their degradation products in the environment. (C) 1998 Elsevier Science B.V.