Mixed Solvent Deuterium Isotope Effects on the Hydrolysis of UO<SUB>2</SUB><SUP>2+</SUP> and Be<SUP>2+</SUP> Ions

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概要

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• Stability constants of the hydrolysis species of UO<SUB>2</SUB><SUP>2+</SUP> ion were determined in pure light water and 80% heavy water containing 3M NaClO<SUB>4</SUB> as an ionic medium at 25°C, and the results were compared with those in pure heavy water. The decrease of the stability constants in hydrolysis reactions of UO<SUB>2</SUB><SUP>2+</SUP> ion, as well as of Be<SUP>2+</SUP> ion, was discussed in terms of the equilibrium theory of the solvent deuterium isotope effects, which is based on the assumptions that activity coefficients of chemical species in isotopic exchange equilibria remain unchanged with the change in the deuterium atom fraction in the solvent, that the solvated hydrogen ion possesses three equivalent lyons, and that the isotopic equilibria are subject to the rule of the simple geometric mean. Satisfactory agreements were found between the observed and calculated values for the relative stability constants of the hydrolysis species of UO<SUB>2</SUB><SUP>2+</SUP> and Be<SUP>2+</SUP> in water of various hydrogen isotopic compositions.

• 公益社団法人 日本化学会の論文

著者

• Ohtaki Hitoshi

  Department Of Chemistry Faculty Of Science And Engineering Ritsumeikan University

• Maeda Masunobu

  Department Of Applied Chemistry Nagoya Institute Of Technology

• KAKIHANA Hidetake

  Research Department, the Energy Research Center

• Maeda Masunobu

  Department of Electrochemistry, Faculty of Engineering, Tokyo Institute of Technology

• Amaya Toshihiko

  Research Laboratory of Nuclear Reactor, Tokyo Institute of Technology

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