Degradation pathway of dicyclanil in water in the presence of titanium dioxide. Comparison with photolysis
Résumé
The solar photolytic behavior of the pesticide 4,6-diamino-2-cyclopropyl-pyrimidine-5-carbonitrile, currently known as dicyclanil, has been mimicked in a, photoreactor operating with. an artificial light,flux. The rate and pathway of degradation were performed An additional study, using TiO2 photocatalysis, has been achieved in order to determine the efficiency of photocatalysis to degrade the molecule. The Catalyst was titania Degussa P-25. The aim of this article was the identification of the intermediate products formed during the irradiation, to establish the degradation pathway of dicyclanil. The kinetics of the,reactions were followed by liquid chromatography with a diode array detector (LC-DAD). Most of the organic compounds occurring during,the, photodegradation, have been identified by means of liquid chromatography and mass,spectrometry coupled techniques (HPLC-MS). Additional analyses were carried out to evaluate the mineralization rates into nitrate and ammonium ions.