Abstract
A thermodynamic derivation, based upon the Gibbs equation, is presented which permits the determination of the proton stoichiometry for the adsorption of a cation, B 2+, by an oxide surface from the pH shift of the adsorption isotherm (log[B 2+] plotted vs log Γ B at constant pH). The method allows the determination of the proton stoichiometry at relatively low adsorbate concentrations, 10 −5 M or less, as well as its dependence upon the surface coverage. The method is applied to the adsorption of Cd 2+, Cu 2+, Pb 2+, and Zn 2+ by amorphous hydrous ferric oxide, and agreement with experimental values of the proton stoichiometry is reasonable.
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