Premium
Use of a three‐plane model to describe charge properties of some iron oxides and soil clays
Author(s) -
MADRID L.,
DÍAZ E.,
CABRERA F.,
ARAMBARRI P.
Publication year - 1983
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1983.tb00812.x
Subject(s) - clay minerals , charge density , adsorption , surface charge , ion , electrolyte , clay soil , charge (physics) , mineralogy , electric charge , chemistry , materials science , geology , soil water , soil science , physics , organic chemistry , electrode , quantum mechanics
Summary The pH‐dependence of surface charge density of three iron oxides and the clay fraction of five horizons of a variable‐charge soil has been studied by adsorption of potential‐determining ions (p.d.i.) and by adsorption of electrolyte ions. The general trend of results for iron oxides can be satisfactorily explained by a model which considers a three‐plane distribution of electric potential. When the model is applied to soil clays the outcome is less satisfactory and, although their charge properties seem to be largely determined by their high content of minerals with variable charge surfaces, the presence of minerals with a permanent charge (clay minerals) should be considered when explaining the particular data, even for those horizons where clay minerals are present in low proportions.