Temperature dependence of octanol-water partition coefficient for selected chlorobenzenes
- Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering and Applied Chemistry
The current emphasis on assessing the environmental impact of both industrial and agricultural chemicals has resulted in an increased reliance on the physical and chemical properties of these compounds to predict their environmental behavior. The octanol-water partition coefficients of seven chlorobenzenes (1,2-dichlorobenzene, 1,4-dichlorobenzene, 1,3,5-trichlorobenzene, 1,2,3,4-tetrachlorobenzene, 1,2,3,5-tetrachlorobenzene, pentachlorobenzene, and hexachlorobenzene) were measured by a conventional shake-flask, batch-contacting method over the temperature range (5 to 45) C. The measurements at 25 C in this study agree well with literature data obtained with comparable methods. The van`t Hoff plots of log K{sub OW} versus T{sup {minus}1} exhibit linearity with values of K{sub OW} increasing by 10%--14% over this temperature range. The enthalpy of phase change ranges from (17 to 24) kJ/mol. These temperature relationships can be incorporated into environmental models which predict the fate of chemicals in aquatic and terrestrial systems over a range of environmental temperatures.
- Sponsoring Organization:
- Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
- OSTI ID:
- 529763
- Journal Information:
- Journal of Chemical and Engineering Data, Vol. 42, Issue 4; Other Information: PBD: Jul-Aug 1997
- Country of Publication:
- United States
- Language:
- English
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