PHOTODEGRADATION OF PIRIMICARB IN NATURAL-WATER AND IN DIFFERENT AQUEOUS-SOLUTIONS UNDER SIMULATED SUNLIGHT CONDITIONS

The kinetics of pirimicarb photodegradation followed a first-order equ ation, in all studied solutions. Photolysis of pirimicarb was strongly increased in the presence of acetone, while methanol did not have any significant effect. The rate of degradation in the presence of natura l river water was about 4.5 times slower than in distilled water. The half-life of pirimicarb in presence of different amount of dissolved h umic and fulvic acids was about 2-10 times longer than in distilled wa ter. The persistence of pirimicarb under aerobic conditions was greate r than under anaerobic conditions.