Adsorption of glyphosate on clays and soils from Paraná State: effect of pH and competitive adsorption of phosphate

Adsorption of glyphosate on clays and soils from Paraná State: effect of pH and competitive adsorption of phosphate

This work showed that the adsorption of glyphosate (GPS) depends on surface area for clays and amount of clays and CEC for soils. Organic matter (OM) had a secondary role in the adsorption of GPS on soils. The adsorption of GPS on soils from Londrina and Floraí counties and clays (montmorillonite, kaolinite) decreased when pH increased, however, for bentonite clay and soil from Tibagi county was kept constant. For the soils, the competitive adsorption between GPS and phosphate showed that displace of GPS by phosphate was related to the amount of clays, CEC and pH. GPS was not easily displaced by phosphate on the clays. The FT-IR spectra of the soils and clays showed that soil from Londrina resembled kaolinite. Thus, this could explain the results of adsorption of GPS and the competitive adsorption between GPS and phosphate.

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Bibliographic Details
Main Authors: Cruz,Lútecia Hiera da, Santana,Henrique de, Zaia,Cássia Thaïs Bussamra Vieira, Zaia,Dimas Augusto Morozin
Format: Digital revista
Language:English
Published: Instituto de Tecnologia do Paraná - Tecpar 2007
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300004
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Description
Summary:This work showed that the adsorption of glyphosate (GPS) depends on surface area for clays and amount of clays and CEC for soils. Organic matter (OM) had a secondary role in the adsorption of GPS on soils. The adsorption of GPS on soils from Londrina and Floraí counties and clays (montmorillonite, kaolinite) decreased when pH increased, however, for bentonite clay and soil from Tibagi county was kept constant. For the soils, the competitive adsorption between GPS and phosphate showed that displace of GPS by phosphate was related to the amount of clays, CEC and pH. GPS was not easily displaced by phosphate on the clays. The FT-IR spectra of the soils and clays showed that soil from Londrina resembled kaolinite. Thus, this could explain the results of adsorption of GPS and the competitive adsorption between GPS and phosphate.

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