Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/6583
Título: Aqueous photochemistry of pesticides triadimefon and triadimenol
Autor: Silva, José P. da
Ferreira, Luís F. Vieira
Silva, Abílio M. da
Palavras-chave: Triadimefon
Triadimenol
Laser flash photolysis
4-Chlorophenoxyl radicals
Chlorophenolate
4-Chlorophenol
1,2,4-Triazole
Data: 2003
Editora: Elsevier
Resumo: The photochemistry of pesticides triadimefon and triadimenol was studied in aqueous solution and in methanol/water mixtures, in controlled and natural conditions. The photodegradation kinetics and product distribution are strongly dependent on the solvent and on the irradiation wavelength. The degradation rates are faster at 254 nm than at 313 nm. The kinetics is faster in water than methanol. Direct photoreaction is an important dissipation pathway of triadimefon in natural water systems while triadimenol is stable in these conditions. 1,2,4-Triazole and 4-chlorophenol are two of the major photodegradation products. The formation of the 4-chlorophenoxyl radical was detected for both pesticides in methanol and methanol/water mixtures. In methanol/water mixtures the reaction of both pesticides also occurs with 4-chlorophenolate formation, which increases with the water content. The photochemical studies of pesticides and other pollutants should be made in conditions as similar as possible to those observed in environmental systems. (C) 2003 Elsevier Science B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.1/6583
DOI: https://dx.doi.org/10.1016/S1010-6030(02)00328-3
ISSN: 1010-6030
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