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Abstract--The interaction of H § and Cu2+-ions with Ca-montmorillonite was investigated in 0.1 tool/ dm 3 solutions of Ca(CIO4)z at 298.2 K by potentiometric titrations using both glass electrodes (for H + ) and ion specific electrodes (for Cu z + ). The experimental data were interpreted on the basis of the surface complexation model. The calculations were performed with the least-squares program FITEQL (Westall, 1982) In addition, the ion exchange equilibria Ca 2+ -Cu 2+ and Ca 2+ -H + had to be taken into account. Arguments are presented to identify the groups -= SOH and -= TOH as surface aluminol groups ---AI(OH)(HzO) and surface silanol groups ---Si-OH, respectively.

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