Abstract
Surface complex formation of K+, NO3−, SO42−, Ca2+, F−, Co2+, and Cr3+ ions was determined on the surface of silica gel. Experimental data obtained by acid–base titration of suspensions were interpreted in terms of the triple-layer model. The value of the deprotonation constant of surface OH could be determined precisely but the protonation constant was rather uncertain. The logarithms of ion pair formation constants for K+, NO3−, Ca2+, and SO42− adsorbed in the β-plane are log KipM,X∼0, therefore these species can be considered inert ions in the investigated pH range. F−, Co2+, and Cr3+ ions were found to be strongly sorbed in the o-plane. In order to provide a good fit and to obtain parameters independent of their initial values, all possible equilibrium must be accounted for in the models.
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