INTERACTION BEHAVIOR OF ORGANOCHLORINE PESTICIDES WITH DISSOLVED JORDANIAN HUMIC-ACID

The interaction behavior of Jordanian humic acid isolated from the sediment of King Talal Dam with some chlorinated pesticides (tetradifon, p,p'-DDE and p,p'-DDT) was studied under different experimental conditions, namely: humic acid concentration, pH, and temperature. The synergistic effect was also studied. The amount of pesticide that did not interact was determined by extraction and analysis by gas chromatography. The interacted amount of pesticide was directly proportional to the concentration of soluble humic acid and inversely proportional to pesticide polarity. There was no significant change in the interacted amount of pesticide with respect to change in temperature. With pH increase, there was a small decrease in the interacted amount of tetradifon, while no changes were detected for p,p'-DDE and p,p'-DDT.