Contribution of the surface diffusion on mass transfer of Ba<sup>2+</sup> in granite matrix

DOI Web Site 8 References
  • Yamaguchi Tetsuji
    Disposal Safety Laboratory, Department of Fuel Cycle Safety Research, JAERI
  • Nakayama Shinichi
    Disposal Safety Laboratory, Department of Fuel Cycle Safety Research, JAERI
  • Kawada Chiharu
    Applied Science Course, Graduate School of Engineering, Tokai University, Present affiliation: Toshiba Corporation, Power Systems & Services Company

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  • 花崗岩マトリクス内におけるBa<sup>2+</sup>の拡散に対する表面拡散の寄与
  • Contribution of the surface diffusion on mass transfer of Ba〔2+〕 in granite matrix
  • Contribution of the surface diffusion on mass transfer of Ba 2 in granite matrix

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Abstract

  The effective diffusivity (De) and the distribution ratio (Kd) of Ba2+ in Inada granite have been determined by the through-diffusion method. Stable BaCl2 solutions of the equal concentration were placed in two reservoirs across a granite sample and the self-diffusion of Ba was observed using radioactive 133Ba. Experiments were performed in triplicate for 10-1, 1 and 10 mol m-3 BaCl2 solutions at 25°C. The De value obtained at a BaCl2 concentration of 10 mol m-3, agreed to the estimated value based on the pore diffusion model. The lower BaCl2 concentrations yielded higher De values and higher Kd values. The variation in De was neither due to the speciation of barium in the solutions nor due to variation in physical properties of the pore structure in the rock because diffusivity of I was the same between 10-1, 1 and 10 mol m-3 BaCl2 solutions. Contribution of diffusion in sorbed state should be responsible for the variation in De.

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