The extraction of Uranium by some trisubstituted phosphine oxides and sulphides
Wang, Martha T.
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The extraction of uranium with O.lM trioctylphosphine oxide in cyclohexane in the presence of hydroxyethylethylenediaminetriacetic acid was shown to be most effective in the pH range from 0.5 to 1.5. A pH of 1.0 has been chosen as the working level for the extraction. It was found that under the above conditions uranium(VI) can be extracted quantitatively. The method used for the determination of uranium was based on the colorimetric method given by Horton and White in which dibenzoylmethane was used to form a colored complex in the presence of pyridine as a buffer agent in ethyl alcohol. The absorbances at the wave length 405 mu were measured. An interference study at a uranium concentration level of 0.050 mg. per ml. was made to find the tolerance level of various diverse ions of 0.500, 0.050 and 0.005 mg. per ml. concentrations. The metal ions that were studied were: aluminium(III), barium(II), bismuth(III), cadmium(II), cerium(III), chromium(III), cobalt(II), copper(II), iron(II), iron(III), lead(II), magnesium(II), manganese(II), nickel(II), potassium(I), silver(I), sodium(I), thorium(IV), zinc(II), and zirconium( IV). It was found that cerium (III), lead(II), thorium(IV) and zirconium(IV) interfered with the extraction of uranium under the above conditions. Triphenylphosphine sulfide was prepared, as described by Michaelis, by the direct addition of elementary sulfur to triphenylphosphine. Attempts were made to use triphenylphosphine sulfide as an extractant for the following metal ions: aluminium(III) bismuth(III), chromium(VI), copper(II), magnesium(II), manganese( VII), mercury(II), tin(II), and zinc(II). The results obtained indicated that triphenylphosphine sulfide did not extract the above metals.
Thesis (M.A.)--Boston University
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