Dataset for "New studies on the photodegradation of the herbicide Glyphosate"

Published: 10 January 2019| Version 1 | DOI: 10.17632/fjvgr9rn2f.1
Contributors:
Maria Alcira Trinelli,
Cecilia Cantera,
Maria Mar Areco,
Maria dos Santos Afonso

Description

The photodegradation of glyphosate (PMG) in aqueous solution by the action of UV-light and the catalytic effect of copper and copper-alga Ulva lactuca was studied. The photodegradation kinetic reaction of PMG can be described using a first-order kinetic model, with a mean rate constant of k = (0.04 ± 0.01) h-1 and a mean half-life () = (17 ± 4) h. The quantum yield () obtained for the photochemical decomposition of PMG was (4.8 ± 0.1) 10-4 mol Einstein-1, and the photodegradation by-products obtained were: acetate, aminomethylphosphonic acid (AMPA), phosphate, sarcosine and to a lesser extent nitrate. The photolytic process seems to be the main responsible for the herbicide degradation. The presence of copper in the reaction media increases 30 times the rate of PMG degradation, with respect to the photodegradation in the absence of the metal. The degradation efficiency of the ternary system PMG-Cu-alga is ≈ 8 times greater than the photolysis of PMG in aqueous solution, but is at least 4 times smaller than the degradation efficiency in the presence of Cu(II). The present work represents a new approach on the photodegradation of the herbicide glyphosate and the results obtained may contribute to the development of new remediation technologies. This data are the results obtained for the photodegradation of PMG

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Photodegradation

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