EPA's Office of Pesticide Programs uses the Koc model for mobility, unless the values for Kd have a smaller coefficient of variation. Usually we get 5 or so measurements in different soils. If the correction for OC results in smaller variation among the soils, we use Koc.

For assessing the environmental fate of pesticides, LogKoc (the organic carbon-water partition coefficient) is the most appropriate adsorption parameter, as it indicates the pesticides' retention in soil versus their mobility in water. This provides a clearer understanding of their potential for leaching and environmental impact.