title: Mass-dependent and mass-independent isotope effects of zinc in a redox reaction.
abstract: We report the isotope fractionation of zinc (Zn) associated with a redox reaction between Zn(0) and Zn(II). Zn isotopes were found fractionated in pyrometallurgical biphase extraction between liquid zinc and molten chloride. The isotopic composition of Zn in the molten chloride phase was analyzed by multiple collector inductively coupled plasma mass spectrometry and reported as (m)Zn/64Zn (m = 66, 67, and 68) ratios. The observed isotope fractionation consists of the mass-dependent and mass-independent isotope effects. The contributions of the nuclear mass and the nuclear volume to the overall isotope effect were evaluated by employing first-principles quantum calculations and using reported isotope shifts in atomic spectra. The magnitude of the mass-dependent isotope effect was explained by the sum of the isotope effect via intramolecular vibrations and the correction to the Born-Oppenheimer electronic energy. The mass-independent isotope effect was correlated with the Gibbs free energy change in the redox reaction.
authors.affiliation: Research Reactor Institute, Kyoto University, 2-1010 Asashiro Nishi, Kumatori, Sennan Osaka 590-0494, Japan. tosiyuki@rri.kyoto-u.ac.jp
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Fujii
authors.forename: Frédéric
authors.initials: F
authors.lastname: Moynier
authors.forename: Akihiro
authors.initials: A
authors.lastname: Uehara
authors.forename: Minori
authors.initials: M
authors.lastname: Abe
authors.forename: Qing-Zhu
authors.initials: QZ
authors.lastname: Yin
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nagai
authors.forename: Hajimu
authors.initials: H
authors.lastname: Yamana