TEMPERATURE-DEPENDENCE OF INFINITE DILUTION ACTIVITY-COEFFICIENTS IN OCTANOL AND OCTANOL WATER PARTITION-COEFFICIENTS OF SOME VOLATILE HALOGENATED ORGANIC-COMPOUNDS

Infinite dilution activity coefficients and Henry's law coefficients h ave been measured for 11 halogenated C-1 to C-3 compounds in 1-octanol above room temperature using a gas-liquid chromatographic measurement method. Then, using our earlier data for these substances in water an d a correlation relating the limiting activity coefficients of a subst ance in pure water and in pure 1-octanol to their octanol/water partit ion coefficients, these latter quantities have been computed. One conc lusion from these measurements is that the limiting activity coefficie nts in octanol and the octanol/water partition coefficients of the hal ogenated compounds studied are only weakly dependent on temperature ov er the range from 25 to 50 degrees C. Also, from these and our earlier data, we have estimated the infinite dilution partial molar excess en thalpies and excess entropies of these compounds in both 1-octanol and water.