Planar chromatography in studies of the hydrophobic properties of some new herbicides

Reversed-phase planar chromatography has been used to study the hydrophobic properties of sixteen new herbicides. Solute retention factors in pure water, log k(w), were determined by linear extrapolation and by the new method based on Oscik's equation. The effect on solute retention and log k(w) values of the pH of the buffer used as mobile phase component was analyzed. The log k(w) values were proposed as descriptors of the hydrophobic properties of the compounds and so were compared with calculated log P values, i.e. partition coefficients in n-octanol-water systems.