METHODOLOGICAL ASPECTS OF THE PESTICIDES CHEMICAL TRANSFORMATION STUDY IN WATER

Life-time of pesticides in aquatic ecosystems is an important ecologic al characteristic, closely connected with the effective rate constant of its degradation in either natural basins or waterflows. Parameter k (eff) may be presented as a sum of the effective rate constants of pes ticide degradation independent one from another and on the degradation canals: k(eff) = Sigma k(i)(phi), where k(i)(phi) is the effective ra te constant of pesticide degradation in the i canal, as a function of the natural conditions. The canals of pesticides chemical transformati on in aquatic ecosystems are evidenced by hydrolysis, direct and sensi bilized photolysis, redox reactions, involving participation of free r adical. The present paper proposes a methodological scheme for pestici des' chemical transformation, based on both laboratory experiments and literature data.