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La reactividad de la superficie de minerales. Interacción con
iones y moléculas de interés ambiental.
The reactivity of the mineral surface. Interaction with ions and
molecules of environmental relevance
Marcelo Avena
Instituto de Química del Sur (INQUISUR), Departamento de Química,
Universidad Nacional del Sur, Bahía Blanca, Argentina ([email protected])
The Earth’s crust can be imagined as an enormous catalytic bed
containing billions of square kilometers of mineral surface. A great deal of this
surface is in contact with water and dissolved substances, forming what is
called the solid-water interface or the mineral-water interface. Many physical
and chemical processes of environmental relevance take place at this interface.
This presentation is focused on the inorganic and physicochemical
viewpoints of the reactivity of mineral surfaces in aqueous media. The analogies
between the reactivity of metal complexes in solution and the reactivity of metal
ions constituting the mineral surface are given. Different methodologies to
detect and identify inner-sphere and outer-sphere surface complexes are
presented, and the role played by these complexes in the speciation, transport
and distribution of substances in the environment is discussed. Case studies of
interaction between a mineral surface and ions such as arsenate, phosphate
and pesticides with ligand properties as glyphosate are shown.