ADSORPTION PROPERTIES OF SILICAS WITH COVALENTLY ATTACHED COMPLEXING GROUPS TOWARDS Zn(ІІ), Hg(ІІ), Fe(ІІІ), Cu(ІІ), Cd(ІІ) AND Pb(ІІ) IONS: UDC 543.43:546.45. Вісник: Хімія 2010, 48 (1), 15-18.