Resumo

TEVEZ, Hector R.  e  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 (K_F and K_L), the adsorption intensity (1/n) and the maximum surface coverage (Γ_max) were obtained. The results show the dependence of the parameters K_L and Γ_maxwith pH and also with the different horizons and particle size.

Palavras-chave : Glyphosate; Adsorption isotherm; horizon; profile.

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