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At low surface concentrations the log-log plots of the experimental adsorption isotherms of ions on oxides show a transition from a linear (Henry's) plot with a tangent equal unity to a Freundlich plot with tangent smaller than unity. A theory has been developed reproducing that striking behavior of these adsorption isotherms. That theoretical treatment was based on a picture of a heterogeneous solid surface, with different adsorption sites-the outermost surface oxygens. Our theoretical study indicates that the binding-to-surface energies of different surface complexes, formed on different surface oxygens, vary in an independent way from one surface oxygen to another.

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