Consideration on Effective Diffusivity of Strontium in Granite

Abstract Diffusive behavior of strontium and certain kinds of divalent cations in Inada granite were studied by a through-diffusion method. In order to examine the effect of sorption onto overall diffusive behavior, two kinds of solutions were used: 0.1M KCl solution and deionized water. The effective diffusion coefficient (De ) and rock capacity factor (a) were (2.0–3.6) xl0–13 m2/s and less than 0.022 in 0.1M KCl solution and (0.32–1.7) x 10 −13m2/s and 1.5–2.4 in deionized water respectively. The De , and α in deionized water were much larger than those in 0.1M KCl solution. These results are well explained by taking into account the diffusion of sorbed ion or the surface diffusion. In support of this mechanism, most De , values of Sr reported for various rocks are found proportional to the sorptivity ( ρRd )-In the case that the sorptivity is low, De of Sr depends on porosity like that of nonsorbed iodide. The effective diffusion coefficient of Sr in rocks was well explained by taking into account por...