Anisotropy and Effect of Salinity in Diffusion and Activation Energy of Cs^+ Ions in Compacted Smectite(Waste Management and Clay Barriers and Civil Engineering,Proceedings of the 13^<th> International Clay Conference)

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概要

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• In-diffusion experiments for Cs^+ ions in compacted Na-smectite were performed in the directions parallel and perpendicular to the orientation of the smectite particles as a function of smectite dry density (between 0.9 and 1.4Mg/m^3), salinity ([NaCl]=0.01 and 0.51M) and temperature (295-333K). The apparent diffusion coefficient (D_a) tended to be higher in the direction parallel than in the direction perpendicular to the orientation of the smectite particles. Higher salinity leads to an increase of the D_a-values for all conditions. The activation energies (ΔE_a) are independent of the orientation of the smectite particles. Higher dry densities correspond to higher ΔE_a-values. For a dry density of 1.0Mg/m^3, the corresponding ΔE_a-value agrees well to a predicted value ΔE_a-value=24.66±0.96 kJ/mol. This value is obtained as the difference of the activation energy for diffusion of cesium in pure water (16.47 kJ/mol) and the Cs/Na ion exchange enthalpy ΔH^o (-11.10 kJ/mol). For a dry density of 1.4Mg/m^3, ΔE_a is 35.20±0.83 kJ/mol. The higher ΔE_a-values found at higher dry densities are attributed to complex effects of ΔH^o and the lowering of porewater activity at high-dry densities.

• 日本粘土学会の論文
• 2006-04-00

著者

• Sato Haruo

  Innovative Research Promotion Office Japan Nuclear Cycle Development Institute (jnc)

関連論文

• Anisotropy and Effect of Salinity in Diffusion and Activation Energy of Cs^+ Ions in Compacted Smectite(Waste Management and Clay Barriers and Civil Engineering,Proceedings of the 13^ International Clay Conference)

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