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

2007; Instituto de Tecnologia do Paraná (Tecpar); Volume: 50; Issue: 3 Linguagem: Inglês

10.1590/s1516-89132007000300004

1678-4324

Lútecia Hiera da Cruz, Henrique de Santana, Cássia Thaïs Bussamra Vieira Zaia, Dimas Augusto Morozin Zaia,

Iron oxide chemistry and applications

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.