Partition coefficients of organochlorine pesticides on soil and on the dissolved organic matter in water

The partition coefficients of organochlorine pesticides (OCPs) between the organic matter of Taichung soil and water (Koc) were evaluated with batch-type experiments. The partition coefficients of OCPs between Aldrich humic acid and water (Kdoc) were estimated with solubility enhancement method as well. In this study, the Kocs of aldrin, heptachlor, and p,p′-DDT are greater than their Kdocs, and the relationship of dieldrin and heptachlor epoxide are opposite. The variations of partition coefficients are discussed. For predicting Kdoc, a log-log regression relationship of Kdoc and Kow is determined.