The metal ion adsorption properties of the microporous hybrid anilinepropylsilica xerogel were studied using divalent copper, zinc, and cadmium ions in aqueous solutions in concentrations ranging from 10(-4) up to 5 x 10(-3) mol l(-1). At low concentrations the surface of the solid phase presents selectivity for Cu(II), even in competitive conditions. This preferential sorption ability for copper in relation to zinc and cadmium ions was interpreted by considering the xerogel morphology. (C) 2003 Elsevier Inc. All rights reserved.