A column method for determination of soil organic partition coefficients of eight pesticides.

A column method was developed to conveniently and reliably determine the soil organic partition coefficients (Koc) of three insecticides (methiocarb, azinphos-methyl, fenthion), four fungicides (triadimenol, fuberidazole, tebuconazole, pencycuron), and one herbicide (atrazine), in which real soil acted as a stationary phase and the water solution of pesticide as au eluent. The processes of sorption equilibrium were directly shown through a breakthrough curve(BTC). The log Koc values are l.69, 1.95, 2.25, 2.55, 2.69, 2.67, 3.10, and 3.33 for atrazine, triadimenol, methiocarb, fuberidazole, azinphos-methyl, tebuconazole, fenthion and pencycuron, respectively