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Artículo

Effect of humic acid on the adsorption/desorption behavior of glyphosate on goethite: Isotherms and kinetics

Arroyave Rodriguez, Jeison Manuel; Waiman, Carolina VanesaIcon ; Zanini, Graciela PilarIcon ; Avena, Marcelo JavierIcon
Fecha de publicación: 02/2016
Editorial: Pergamon-Elsevier Science Ltd
Revista: Chemosphere
ISSN: 0045-6535
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

The effects of humic acid (HA) on the adsorption/desorption of glyphosate (Gly) on goethite were investigated under pseudo equilibrium conditions by adsorption isotherms and under kinetic conditions by ATR-FTIR spectroscopy. Isotherms reveal that the attachment of Gly is almost completely inhibited by HA molecules. The opposite effect is not observed: HA adsorption is not affected by the presence of Gly. ATR-FTIR allowed the simultaneous detection of adsorbed HA and Gly during kinetic runs, revealing that HA at the surface decreases markedly the adsorption rate of Gly likely as a result of a decreased availability of sites for Gly adsorption and because of electrostatic repulsion. In addition, HA in solution increases the desorption rate of Gly. The rate law for Gly desorption could be determined giving important insights on the desorption mechanism. The herbicide is desorbed by two parallel processes: i) a direct detachment from the surface, which is first order in adsorbed Gly; and ii) a ligand exchange with HA molecules, which is first order in adsorbed Gly and first order in dissolved HA. Rate constants for both processes were quantified, leading to half-lives of 3.7 h for the first process, and 1.4 h for the second process in a 400 mg L-1 HA solution. These data are important for modeling the dynamics of glyphosate in environmentally relevant systems, such as soils and surface waters.
Palabras clave: Desorption Kinetics , Herbicides , Humic Substances , Metal Oxide Surface , Surface Spectroscopy
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/54775
URL: http://www.sciencedirect.com/science/article/pii/S0045653515304136
DOI: http://dx.doi.org/10.1016/j.chemosphere.2015.11.082
Colecciones
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos(INQUISUR)
Articulos de INST.DE QUIMICA DEL SUR
Citación
Arroyave Rodriguez, Jeison Manuel; Waiman, Carolina Vanesa; Zanini, Graciela Pilar; Avena, Marcelo Javier; Effect of humic acid on the adsorption/desorption behavior of glyphosate on goethite: Isotherms and kinetics; Pergamon-Elsevier Science Ltd; Chemosphere; 145; 2-2016; 34-41
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