Ozonation of isoproturon adsorbed on silica particles under atmospheric conditions

► Little is known about the atmospheric heterogeneous processes of pesticides. ► Heterogeneous ozonation kinetics is faster for lower surface coverage. ► Isoproturon very likely adsorbs on the solid support in isolated aggregates. ► Trifluralin is about 20-25-times less reactive to ozone than isoproturon. ► The lifetime of isoproturon in particulate phase is ca. one week regarding ozone.