The refinement of the mechanism of Mo(VI) deposition (proposed previously) from aqueous solutions on the gamma-alumina surface by investigating critical mechanistic points is the subject of the present work. A mechanistic model involving the adsorption of Mo7O246- and MoO42- ions on sites created by the protonated surface hydroxyls of gamma-alumina in the inner Helmholtz plane (IHP) of the double layer developed between the surface of the gamma-alumina particles and the molybdate solutions, as well as the deposition of the MoO42- ions through surface reaction with the neutral surface hydroxyls has been developed; ft has been tested over a wide range of impregnation parameters (pH = 8.5-4.1 at 25-degrees-C, temperature 25-50-degrees-C at pH = 5 and doping of the carrier with various amounts of Na+ and Li+ ions). The testing of the model included the derivation of various equations corresponding to the model deposition equilibria, the calculation of the amount of the deposited Mo, of the difference in the isotherms of the hydrogen adsorption in presence and absence of molybdates, and of the zeta-potential of the gamma-alumina particles in the molybdate solution (using an interactive code for the calculation of chemical equilibria in aqueous systems called SURFEQL), and the comparison of these parameters with the corresponding ones determined experimentally.