Diffusion and migration of ions in sedimentary rock matrix: Effects of ionic strength and tracer concentration on diffusion of Cs+ ions in sandstone

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Abstract

In-diffusion experiments for Cs+ and I- in sandstone were performed as a function of ionic strength ([NaCl]=0.01, 0.51M) and tracer concentration ([CsI]=7.5E-5, 1.5E-2M) together with the measurements of the physical and chemical properties of sandstone, and apparent diffusivities (Da) for Cs were obtained. The obtained Da-values for Cs+ scarcely depended on [NaCl], but increased with increasing [Cs+]. This trend is consistent with that of rock capacity factors (α), indicating that distribution coefficient (Kd) onto sandstone and effective diffusivity scarcely depend on [NaCl]. The concentration profiles of I- were all in already breakthrough. Although this indicates that I- diffusion is faster than that of Cs+, the concentration profiles of I may have been lower than those for blank samples, judging synthetically from the correlations between α-values and the concentration profiles of Cs + and from the concentration profiles of I- in the blank samples. Finally, the effects of [Cs+] and [NaCl] on Kd-values for Cs+ were discussed from the viewpoint of adsorption by ion exchange and electrostatic attraction. The Kd-values were considered to be combined sorption by both reactions.

Original languageEnglish
Pages (from-to)597-602
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume807
Publication statusPublished - Dec 1 2004
Externally publishedYes
EventScientific Basis for Nuclear Waste Management XXVII - Kalmar, Sweden
Duration: Jun 15 2003Jun 19 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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