Retardation of mobile radionuclides in granitic rock fractures by matrix diffusion

P. Hölttä (Corresponding Author), Antti Poteri, M. Siitari-Kauppi, N. Huittinen

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Transport of iodide and sodium has been studied by means of block fracture and core column experiments to evaluate the simplified radionuclide transport concept. The objectives were to examine the processes causing retention in solute transport, especially matrix diffusion, and to estimate their importance during transport in different scales and flow conditions. Block experiments were performed using a Kuru Grey granite block having a horizontally planar natural fracture. Core columns were constructed from cores drilled orthogonal to the fracture of the granite block. Several tracer tests were performed using uranine, 131I and 22Na as tracers at water flow rates 0.7–50 μL min−1. Transport of tracers was modelled by applying the advection–dispersion model based on the generalized Taylor dispersion added with matrix diffusion. Scoping calculations were combined with experiments to test the model concepts. Two different experimental configurations could be modelled applying consistent transport processes and parameters. The processes, advection–dispersion and matrix diffusion, were conceptualized with sufficient accuracy to replicate the experimental results. The effects of matrix diffusion were demonstrated on the slightly sorbing sodium and mobile iodine breakthrough curves.
Original languageEnglish
Pages (from-to)983 - 990
Number of pages8
JournalPhysics and Chemistry of the Earth
Volume33
Issue number14-16
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Radioisotopes
radioactive isotopes
radionuclide
Rocks
rocks
tracers
matrix
tracer
granite
matrices
rock
sodium
Sodium Iodide
Solute transport
experiment
Experiments
water flow
iodide
breakthrough curve
iodine

Keywords

  • Block-scale experiments
  • Crystalline rock
  • Matrix diffusion
  • Migration

Cite this

Hölttä, P. ; Poteri, Antti ; Siitari-Kauppi, M. ; Huittinen, N. / Retardation of mobile radionuclides in granitic rock fractures by matrix diffusion. In: Physics and Chemistry of the Earth. 2008 ; Vol. 33, No. 14-16. pp. 983 - 990.
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Retardation of mobile radionuclides in granitic rock fractures by matrix diffusion. / Hölttä, P. (Corresponding Author); Poteri, Antti; Siitari-Kauppi, M.; Huittinen, N.

In: Physics and Chemistry of the Earth, Vol. 33, No. 14-16, 2008, p. 983 - 990.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Retardation of mobile radionuclides in granitic rock fractures by matrix diffusion

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AB - Transport of iodide and sodium has been studied by means of block fracture and core column experiments to evaluate the simplified radionuclide transport concept. The objectives were to examine the processes causing retention in solute transport, especially matrix diffusion, and to estimate their importance during transport in different scales and flow conditions. Block experiments were performed using a Kuru Grey granite block having a horizontally planar natural fracture. Core columns were constructed from cores drilled orthogonal to the fracture of the granite block. Several tracer tests were performed using uranine, 131I and 22Na as tracers at water flow rates 0.7–50 μL min−1. Transport of tracers was modelled by applying the advection–dispersion model based on the generalized Taylor dispersion added with matrix diffusion. Scoping calculations were combined with experiments to test the model concepts. Two different experimental configurations could be modelled applying consistent transport processes and parameters. The processes, advection–dispersion and matrix diffusion, were conceptualized with sufficient accuracy to replicate the experimental results. The effects of matrix diffusion were demonstrated on the slightly sorbing sodium and mobile iodine breakthrough curves.

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