INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Adsorption of glyphosate in montmorillonite interlayers: Theoretical calculations.
L. TRIBE; A. KHOURY; T. GEHRIS; M. DOS SANTOS AFONSO
Atlanta Georgia USA
Congreso; American Chemical Society 231st National Meeting; 2006
American Chemical Society
The herbicide glyphosate (N-phosphonomethylglycine) interacts strongly with many soil components. It forms strong complexes with manymetals in solution, and it is adsorbed through innersphere complexation to iron- and aluminium oxides. Glyphosate can also be adsorbed byclay minerals by forming complexes with interlayer cations. Montmorillonite is a layered clay, with interlayer surfaces composed of silicon andoxygen atoms. This work explores the possible ways in which glyphosate molecules may interact with the surfaces in the interior of thelayers, using molecular modeling and semi-empirical level theoretical calculations. The effects of solvation and pH are considered.