The formation of surface complexes at the mineral-water interface has important implications for the properties of oxide surfaces and for their reactivity, particularly toward dissolution. Here, direct spectroscopic evidence is provided for the formation of fluorescent (inner-sphere) complexes between aluminum and 8-hydroxyquinoline-5-sulfonate at the aluminum oxide-water interface. The concentration of the surface complex is shown, by fluorescence spectroscopy, to be constant during long-term dissolution of the oxide. This finding demonstrates that the oxide surface is continuously regenerated during the dissolution in accord with the surface-controlled model of mineral dissolution.
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Hering et al. (1991) studied this question.