1-Octanol-water partition coefficient temperature dependence

Finizio, A., Di Guardo, A. (2001) Estimating temperature dependence of solubility and octanol-water partition coefficient for organic... 

Octanol/Water Partition Coefficient, log KqW at 25°C and reported temperature dependence equations ... 

Lei, Y.D., Wania, F., Shiu, W.Y., Boocock, G.B. (2000) HPLC-based method for estimating the temperature dependence of n-octanol-water partition coefficients. J. Chem. Eng. Data 45, 738-742. 

Bhatia, S.R. and Sandler, S.l. Temperature dependence of infinite dilution activity coefficients in octanol and octanol/water partition coefficients of some volatile halogenated organic compounds. J. Chem. Eng. Data, 40(6) 1196-1198,1995. 

Copolovici, L.O. and Niinemets, U. Temperature dependencies of Henry s law constants and octanol/water partition coefficients for key plant volahle monoterpenoids. Chemosphere, 61(10) 1390-1400, 2006. 

Octanol/Water Partition Coefficient, log KoWat 25°C or as indicated and reported temperature dependence equations. Additional data at other temperatures designated are compiled at the end of this section ... 

Reported Henry s law constants, octanol-water partition coefficients and octanol-air partition coefficients of 1,2-dichlorobenzene at various temperatures and temperature dependence equations... 

Rapid hydrolysis — This makes measurement of solubility in water and octanol-water partition coefficient impossible. Consider an example isocyanates have half-lives in water at normal temperatures and pH of a few seconds. There can be no valid reference data for them, nor any practical application of a partition coefficient. That is a clear case others will depend upon the half-life, the intended use of the result, and any validation required. 

Toxicity of many substances, their biological uptake and hpophilic storage in the body, their bioconcentrations (movements through the food chain resulting in higher concentrations), and so forth, as well as their fate in the environment can be predicted from their octanol/water partition coefficients, Poet-The partition or distribution coefficient of a substance is the ratio of its solubility in two immiscible solvents. It is a constant without dimensions, and depends on the temperature and pressure. Thus,... 

The uptake of organic contaminants by plants from biosolids-amended soil depends on the physicochemical properties of organic compoimds and the physiology of plants [92-95]. Plant uptake of organic chemicals and their distribution within plants have been shown to be affected by (1) the organic chemicals physicochemical properties, including solubility, vapor pressure, octanol-water partition coefficient Kow)> and Henry s law constants (iC ), (2) environmental conditions such as temperature, air disturbance and soil organic matter content, and (3) plant characteristics, for example the shape of the leaves, type of root system, and lipid and cuticle characteristics and contents [94]. 

Octanol is quite insoluble in water and vice versa hence the partition coefficients are not strongly temperature dependent, being mostly in the order of 0.001 to 0.01 log units per K (Lyman, 1990b). Even the low mutual solubility - at equilibrium the aqueous phase contains 4.5 x 10" mol/11-octanol and the organic phase contains 2.3 mol/1 water (Lyman, 1990b) - reveals so that the 1-octanol/water partition coefficient does not equal the ratio of the compounds solubilities in the individual solvents. This miscibility of the solvent phases, as well as ionization and association phenomena, limits the stringent validity of the presumed Nemst distribution, which, moreover, requires infinite dilution. Hence, at concentrations > 0.01 mol/1, is frequently observed to be dependent on the solute concentration. 

---