pH dependence of Glyphosate adsorption on soil horizons

Hector R. Tévez, Maria dos Santos Afonso


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 Γmax with pH and also with the
different horizons and particle size.

Palabras clave

Glyphosate; Adsorption isotherm; horizon; profile.

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