The study on adsorption of heavy metals (Cd(II), Ni(II) and Pb(II)) at the Al₂O₃-SiO₂/electrolyte solution interface is presented in this paper. The influence of ionic strength, pH, background electro- lyte (NaClO4) concentration and composition of metal oxide on adsorption of Cd(II), Ni(II) and Pb(II) from solution of initial concentration ranged from 1×10^-6 to 1×10^-3 mol/dm³ in the mentioned system was investigated. The adsorptions edge parameters (pH50% and ∆pH10-90%) for different con- centrations of electrolyte were presented. The adsorption measurements were complemented by the potentiometric titration of Al₂O₃-SiO₂ suspensions and electrophoretic measurements. Charge rever- sal point (CR2) can be observed for solution concentration of 10^-3 mol/dm³ as a result of Cd(II), Ni(II) and Pb(II) ions adsorption.