The fungicide Flutriafol was mineralised on irradiation of its aqueous solution, in which anatase P25 was suspended, with a medium pressure mercury lamp under an air stream. The half-time of reaction, tin, i.e. the time at which the total organic carbon of the solution was halved, decreased in the series of P25 loaded with RuO2Pt>Ag>MnO2. Heating P25 at 500 degreesC for 3 h reduced t(1/2) compared to bare, unheated P25.