The present work focus on the preparation of adsorption beds using variable charge oxidic material from soils of Mérida state, Venezuela, after thermal treatment up to 800 C during 3 h. X Ray diffraction shows presence of iron and aluminum oxides and little or no change in de material composition after thermal treatment. Specific surfaces of calcined materials, obtained from N2 adsorption, range from 6 to 15 m2 g–1 and pore volume between 70 and 140 µL g–1 Adsorption vs pH of Cu2+ and Zn2+ was studied. The former shows maximum