Degradation pathway of dicyclanil in water in the presence of titanium dioxide. Comparison with photolysis.
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 TiO(2) 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.
Laboratoire des Sciences et Stratégies Analytiques (LSSA), Bât. Jules Raulin, Université Claude Bernard Lyon 1, 69622 Villeurbanne Cedex, France.
Gaëlle
G
Goutailler
Chantal
C
Guillard
René
R
Faure
Olivier
O
Païssé
D002384:Catalysis; D002853:Chromatography, Liquid; D007306:Insecticides / Q000737:chemistry*; D007605:Juvenile Hormones / Q000737:chemistry*; D007700:Kinetics; D013058:Mass Spectrometry; D009566:Nitrates / Q000737:chemistry; D010782:Photolysis; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D007306:Insecticides; D007605:Juvenile Hormones; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D014867:Water; C009495:titanium dioxide; D014025:Titanium; C121718:dicyclanil