Koc organic carbon-water partition

Adapted from Lyman et al. (1990) unless otherwise noted. BCF, bioconcentration factor Kow, octanol-water partition coefficient S, water solubility Koc, organic carbon-water partition coefficient. 

Koc, organic carbon-water partition co cient K u, octanol-water partitum co icient. 

The BUSES model provides an estimate of the organic carbon/water partition coefficient (Koc) based on the octanol/water partition coefficient (Kow)- From these data, it is evident that the methyltins are less likely to partition onto organic carbon (in sediments, soils, biota) than are the butyl- and octyltin compormds due to then-lower partition coefficients and higher water solubilities. The 7/oc value can then be used to derive sohds/water partition coefficients in suspended matter, in sediment, and in soil using values of 10%, 5%, and 2% for organie carbon, representing typical organic carbon contents of suspended matter, sediment, and soil, respeetively. 

The octanol-water partition coefficient KqW provides a direct estimate of hydrophobicity or of partitioning tendency from water to organic media such as lipids, waxes and natural organic matter such as humin or humic acid. It is invaluable as a method of estimating KoC, the organic carbon-water partition coefficient, the usual correlation invoked being that of Karickhoff (1981)... 

Di-ft-octylphthalate also strongly adsorbs to soils and does not undergo leaching to groundwater, as indicated by its estimated soil organic carbon/water partition coefficient (Koc) of about 19,000. Volatilization from soils is not expected to be significant (HSDB 1994 Vista Chemical 1992). 

Soil organic carbon/water partition coefficient, log Koc ... 

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