The interfacial properties of zirconium oxide, titanium oxide and bismuth oxide have been studied under various experimental conditions. The oxides were characterized by means of their pH titration curves, intrinsic dissociation constants [pKai*(intr.), i = 1, 2) and point of zero charge (pHpzc) in varying concentrations of KNO3 and Na2CrO4 solutions. The pHpzc values of all the oxide samples tended to shift to higher pH values in the presence of Na2CrO4 solution and remain the same in the presence of KNO3 solution. A mechanism for the sorption process is proposed proceeding through an exchange with surface OH– or H2O groups and is interpreted as a case of specific adsorption.
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