The extraction of mineral acids and transition metal ions by Di(n-octyl) arsinic acid (DOAA) in chloroform
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1972
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The extraction of HClO₄, HCl, HBr, HNO₃, H₂SO₄, HI and the metal ions SC(III) in HCl solution, Ce(III), Eu(III), Ho(III) and Yb(III) in acetate buffered solutions by chloroform solutions of diocytlarsinic acid (DOAA), (n-C₈H₁₇)₂AsOOH, was investigated. The loading experiments with perchloric acid showed that 0.1 M DOAA, after equilibration with HClO₄ of initial concentration of 5 M to 9 M, forms a 1:1 adduct DOAA[dot]HClO₄. Molecular formula determinations indicate that this adduct is dimeric. Except for sulfuric and hydriodic acids, the loading curves for the other mineral acids are similar to the curve for HClO₄ with well defined plateaus at molar ratios of [H⁺][subscript o]/[DOAA][subscript o] equal to unity in the range of initial aqueous acid concentrations from about 3 M to 7 M. Reagent dependence studies showed that the mineral acids form 2:1 adducts with DOAA at 0.1 M aqueous concentrations. Sulfuric acid was not extracted at this concentration. A mixture of 2:1 and 2:2 adducts is formed between 0.5 M and 1.0 M aqueous sulfuric acid. Hydriodic acid reduced DOAA. Water was coextracted with all mineral acids. The concentration of water in the organic phase decreased with increasing aqueous acid concentrations above 6 M. ...
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Major chemistry