Separation of Am(III), Cm(III), and Cf(III) using capillary electrophoresis

H. Kikunaga 1 , T. Yoshimura 2 , T. Kuribayashi 3 , Y. Kitamoto 4 , N. Takahashi 5 , H. Haba 6 , Y. Ezaki 7 , S. Enomoto, T. Mitsugashira,  and A. Shinohara 8
  • 1  Osaka University, Graduate School of Science, Osaka 560-0043, Japan
  • 2  Osaka University, Graduate School of Science, Department of Chemistr, Osaka 560-0043, Japan
  • 3  Japan
  • 4  Osaka University, Department of Chemistry, Toyonaka, Osaka 560-0043, Japan
  • 5  Japan
  • 6  Japan
  • 7  Japan
  • 8  Japan


Trivalent actinides Am(III), Cm(III), and Cf(III) were successfully separated for the first time using capillary electrophoresis in 2-hydroxyisobutyric acid/acetic acid. It was found that the ionic radius was primarily important for separation of trivalent actinides as well as lanthanides in this condition. The stability constants of the Am(III) complexes with 2-hydroxyisobutyrate were estimated using the correlations between the molar fraction ratio of lanthanides and their ionic radii.

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