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Time evolution and competing pathways in photodegradation of trifluralin and three of its major degradation products

Tagle, Martín G Sarmiento ; Laura Salum, María ; Buján, Elba I ; Argüello, Gustavo A

Photochemical & photobiological sciences, 2005-11, Vol.4 (11), p.869-875 [Periódico revisado por pares]

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Título:
Time evolution and competing pathways in photodegradation of trifluralin and three of its major degradation products
Autor: Tagle, Martín G Sarmiento ; Laura Salum, María ; Buján, Elba I ; Argüello, Gustavo A
Assuntos: Acetonitriles - chemistry ; Pesticide Residues - chemistry ; Photochemistry ; Solubility ; Time Factors ; Trifluralin - chemistry ; Water - chemistry
É parte de: Photochemical & photobiological sciences, 2005-11, Vol.4 (11), p.869-875
Descrição: The herbicide trifluralin (I)(N,N-di-n-propyl-2,6-dinitro-4-trifluoromethylaniline) decomposes, by the action of UV-Vis light (lambda > 300 nm), to several products, the most important (because they give subsequent photochemical reactions) being N-n-propyl-2,6-dinitro-4-trifluoromethylaniline (VI), 2-ethyl-7-nitro-5-trifluoromethyl-1H-benzimidazole 3-oxide (VII) and 2,6-dinitro-4-trifluoromethylaniline (XII). The time evolution of degradation of trifluralin (I) and the aforementioned three main photoproducts was studied in water and acetonitrile as solvents. The pseudo-first order rate constants allow one to calculate the branching ratios for some of the reactions involved. The preference for either N-dealkylation or cyclization depends on the solvent employed. Dissolved oxygen accelerates the photodegradation, especially the dealkylation.
Editor: England
Idioma: Inglês

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