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In situ anion diffusion experiments using radiotracers.

Mats Jansson1, Trygve E Eriksen

  • 1Division of Nuclear Chemistry, Department of Chemistry, Royal Institute of Technology, SE 100 44 Stockholm, Sweden. matsja@kth.se

Journal of Contaminant Hydrology
|January 22, 2004
PubMed
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Diffusion of iodide and pertechnetate in compacted bentonite was studied in situ. Results indicate two diffusion paths, with values consistent with laboratory experiments, crucial for nuclear waste disposal safety.

Area of Science:

  • Geochemistry
  • Environmental Science
  • Materials Science

Background:

  • Compacted bentonite is a key material for nuclear waste disposal barriers.
  • Understanding solute diffusion in bentonite is critical for predicting contaminant transport.
  • In situ experiments provide realistic conditions for diffusion studies.

Purpose of the Study:

  • To investigate the in situ diffusion of iodide and pertechnetate in compacted bentonite.
  • To model diffusion processes considering multiple pathways.
  • To compare in situ diffusion data with laboratory findings.

Main Methods:

  • In situ diffusion experiments conducted in the CHEMLAB borehole laboratory.
  • Investigation of iodide (anion) and pertechnetate (redox-sensitive anion).

Related Experiment Videos

  • Modeling of diffusion profiles using a two-path diffusion model (intralamellar and external water).

    • Main Results:

    • Pertechnetate diffused mostly unreduced (TcO4-) despite reducing conditions, with some localized reduction by iron minerals.
    • Concentration profiles required a two-path diffusion model: intralamellar and external water diffusion.
    • Apparent diffusivities and capacity factors for both iodide and pertechnetate were determined for each diffusion path.

    Conclusions:

    • In situ diffusion behavior of iodide and pertechnetate in compacted bentonite is complex, involving multiple diffusion pathways.
    • The obtained diffusion parameters align with laboratory-derived values, validating the experimental approach.
    • Findings contribute to a better understanding of radionuclide migration in engineered barriers for nuclear waste repositories.