Chelation Ion Chromatography on 1-(2-Pyridylazo)-2-naphthol Sorbed Stannic Silicate: Selective Separation of Cd2+, Hg2+ and Pb2+ from some Transition Metal Ions

Selective separation of three of the most toxic metal ions Cd2+, Hg2+ and Pb2+ has been achieved on a column packed with 1-(2-pyridylazo)-2-naphthol (PAN) sorbed stannic silicate using nitric acid solution of pH 1 and 6 as eluents. Adsorption behavior of several metal ions like Al3+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+ on PAN sorbed stannic silicate from aqueous solution at different pH (from 1 to 6) was studied to calculate their distribution coefficients. In addition to the selective separation of Cd2+, Hg2+ and Pb2+ several binary separations of metal ions e. g., Hg2+ - Al3+, Pb2+ - Cr3+, Cd2+ - Cr3+ and Hg2+ - Cr3+ using aqueous solutions of pH 6 and pH 1 aseluents have been successfully achieved on PAN sorbed stannic silicate.