Adsorption of calcium and europium from 0.001‐1 M solutions of different 1:1 electrolytes on silica and alumina was studied as a function of pH, surface charge density σ0, ionic strength and temperature. Adsorption of multivalent cations on a negatively charged surface is competitive with respect to monovalent cations, i.e., the increase of the ionic strength leads to a decrease of multivalent ions adsorption. In contrast, adsorption of multivalent cations on a positively charged surface is insensitive to the concentration of monovalent cations or even increases with the ionic strength.
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Marek Kosmulski (1994) studied this question.
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