MEtal-IOn Selectivity of Phosphoric ACID Rsin in Aqueous Nitric ACID Media

摘要

Metal ion selectivity of a phosphoric acid resin, which was derived from addition of phosphoric acid to epoxy proups of macroreticular poly, was studied by measuring pH dependency of distribution ratios of various metal ions between RGP and nitric acid solutions. In nitric acid media, RGP exhiits extremely high adsorption ability toward Ti(IV), MO(VI) and Fe(III). Furthermore, its selectivity sequence ofr cmmon trivalent and divalent metal inons was quie different fro mthat of conventional cation exchange resins havign sulfonic acid groups suggesting that RGP will be useful for the elimination of some heavy metal ions which are not strongly adsorbed by sulfonic acid rsins.