The Chemistry of Protactinium. III. A Study of the Sulfate Complex of Protactinium(V) by the Solvent Extraction Technique Using TTA as the Chelating Agent

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  • Toshikazu Mitsuji
    The Research Institite for Iron, Steel and Other Metals, Tohoku University
  • Shin Suzuki
    The Research Institite for Iron, Steel and Other Metals, Tohoku University

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<jats:title>Abstract</jats:title> <jats:p>The behavior of pentavalent protactinium in sulfuric acid solutions was investigated by paper electrophoresis and by the TTA-benzene extraction method. From the results of this investigation, it is recognized that the Pa(OH)2(SO4)+ ion exists predominantly in dilute sulfuric acid solutions (pH 0.4–2.2), and that the complexing reaction of pentavalent protactinium by the sulfate ion may proceed as;</jats:p> <jats:p>Pa(OH)4++2H++SO42−\ightleftarrowsPa(OH)2(SO4)++2H2O.</jats:p> <jats:p>The stability constant of Pa(OH)2(SO4)+ was also determined by the solvent extraction method to be 6.4 at an ionic strength of 1.38.</jats:p>

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