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Boletín de la Sociedad Geológica Mexicana
versión impresa ISSN 1405-3322
Resumen
TEVEZ, Hector R. y AFONSO, Maria dos Santos. pH dependence of Glyphosate adsorption on soil horizons. Bol. Soc. Geol. Mex [online]. 2015, vol.67, n.3, pp.509-516. ISSN 1405-3322.
Pesticides bring many problems to the environment and to human health. The first rationale for their use is increased food production. Glyphosate N-(phosphonomethyl)glycine (PMG) is a non-selective, post emergent, and broad spectrum herbicide, very well known for its extensive application in agriculture worldwide. PMG adsorption experiments were carried out in three horizons of a Typic Haplustoll soil from the Province of Santiago del Estero, Argentina. Adsorption isotherms were fitted using Freundlich and Langmuir models. The affinity constants (KF and KL), the adsorption intensity (1/n) and the maximum surface coverage (Γmax) were obtained. The results show the dependence of the parameters KL and Γmaxwith pH and also with the different horizons and particle size.
Palabras llave : Glyphosate; Adsorption isotherm; horizon; profile.