Diffusion of an ion in rock pore water and its relation to pore characteristics
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概要
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Diffusion of iodide anion in rock pore water and its relation to porosity and pore structure were investigated in order to evalute diffusivity of "non-sorbing" radionuclides in various rock matrix. Porosities and pore-size distributions of various rock samples (diameter: 20 or 40 mm, length: 5 mm) of siliceous sedimentary rocks, andesites, schists, limestone, sandstone hornfels, granites and tuffs were measured by the water saturation method and the mercury intrusion porosimetry. The water saturation porosity ε<SUB> w</SUB> of these rocks varied from 0.1 to 48% and is considered to be close to the total porosity ε<SUB> tot.</SUB> The mercury intrusion method is considered to measure the pores larger than 5nm and might give the porosity em close to the transport porosity ε<SUB> tra.</SUB><BR>The mercury porosimetry method provided pore-size distribution data of the rocks and they can be classified into two types: type-A has mainly larger pores from micro to nano pores and type-B has mainly pores smaller than 25 nm (nano and sub-nano pores).<BR>Effective diffusion coefficients De of iodide anion for these water-saturated rocks were measured at room temperature using a simple diffusion cell, and their relation to the porosities ε<SUB> tot.</SUB> and ε<SUB> tra.</SUB> were studied. D<SUB> e</SUB> and <SUB> tra.</SUB> have a rough linear correlation D<SUB> e</SUB>=5.3×10<SUP> -10</SUP> ε<SUB> tra.</SUB><SUB> tra.</SUB> <SUP> 1.3</SUP> in a logarithmic diagram for most of the rocks. This relation is very useful to estimate effective diffusivities of ions in various rock matrix.
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