Kinetics of photochemical degradation of imazapyr in aqueous solution

Kinetic parameters of imazapyr photodegradation in aqueous solution are pre sented at two pH values and different concentrations. To study the effect o f UW and sunlight irradiation reactions were carried out by using a pyrex r eactor equipped with UV high pressure mercury lamp and a solar simulator (H eraeus Suntest CPS+). The depletion of imazapyr concentration in water solu tion always followed first order kinetic. The half-life in water was 18.99 and 24.67 minutes at pH 7.0 and 4.0,respectively. The influence of organic matter on the photolytic processes was studied irradiating a solution of im azapyr with suspended humic acids (1:1 w:w).