info:eu-repo/semantics/article
Glyphosate photodegradation: Stoichiometry, kinetic and catalytic effects
Fecha
2019-10Registro en:
Trinelli, María Alcira; Cantera, Cecilia Gisela; Areco, María del Mar; Dos Santos Afonso, María; Glyphosate photodegradation: Stoichiometry, kinetic and catalytic effects; Inderscience Enterprises; International Journal of Environment and Health; 9; 4; 10-2019; 306-326
1743-4955
1743-4963
CONICET Digital
CONICET
Autor
Trinelli, María Alcira
Cantera, Cecilia Gisela
Areco, María del Mar
Dos Santos Afonso, María
Resumen
Photodegradation of glyphosate (PMG) in aqueous solution by the action of UV-light and the catalytic effect of copper and copper-alga Ulva lactuca is described. The photodegradation kinetic reaction of PMG can be explained using a first-order kinetic model, with a mean rate constant of k = (0.04 ± 0.01) h–1 and a mean half-life (τ) = (17 ± 4) h. The quantum yield (φ) obtained for the photochemical decomposition of PMG was (4.8 ± 0.1) 10–4 mol Einstein–1. The resulting photodegradation byproducts obtained were acetate, aminomethylphosphonic acid (AMPA), phosphate, sarcosine and to a lesser extent nitrate. The rate of PMG degradation is increased by the presence of copper and Cu-alga Ulva lactuca in the reaction media. The present work represents a new understanding on the photodegradation of the herbicide glyphosate and the results obtained may contribute to the development of new remediation technologies.