Preconcentration of trace metal ions by combined complexation-anion exchange : Part 2. Cobalt,zinc, cadmium and lead with 8-hydroxyquinoline-5-sulfonic acid [1] |
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Authors: | Douglas G Berge John E Going |
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Institution: | Department of Chemistry, University of Wisconsin—Oshkosh, Oshkosh, WI 54901 U.S.A.;Midwest Research Institute, 425 Volker Boulevard, Kansas City, MO 64110 U.S.A. |
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Abstract: | The ligand, 8-hydroxyquinoline-5-sulfonic acid, forms anionic complexes with cobalt(II), zinc(II), cadmium(II), and lead(II), each resulting complex showing a high affinity for anion-exchange resins. The effect of pH, ligand/metal ratio, volume, and concentration on percent retention of the anionic complexes by an anion-exchange resin are reported. At optimum conditions, all four metals are quantitatively retained by the column. Zinc, cadmium and lead(II) ions are completely eluted with 11 ml or less of 2 M HN03; cobalt(II) is totally removed by 12 M HCl and 2 M HNO3. Concentration enhancements of 100-fold are easily achieved. All four anionic complexes can be left on the column for 7 days and still be quantitatively (99%) recovered. A ligand-loaded resin column can also remove all four metals quantitatively. Distribution coefficients for the metal complexes and their ligand/metal ratios were determined by using batch methods that may also serve as the isolation procedure. |
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