Abstract
Abstract The sorption of various inorganic anions (nitrate, chloride, bromide, and iodide) at a colloidal aluminum oxide/water interface was investigated by the potentiometric titration method. The triple-layer model was applied to interpret the experimental data obtained. The intrinsic protonation constant of hydroxyl groups (pK int al) was determined and is given as a mean value of 4.9. The intrinsic surface complexation constants (p∗ K int A-) for nitrate, chloride, bromide, and iodide were determined and are presented as 5.6, 5.4, 5.5, and 5.5, respectively. The values obtained indicate that the sorption of all the anions examined has mainly a nonspecific character.
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