TY - GEN
T1 - Effect of ionic strength on the transport parameters of tritiated water, iodide and H14CO3- in Boom Clay
AU - Aertsens, Marc
AU - De Cannière, Pierre
AU - Moors, Hugo
AU - Van Gompel, Marc
A2 - Valcke, Elie
A2 - Mariën, An
A2 - Maes, Norbert
N1 - Score = 3
PY - 2009/12
Y1 - 2009/12
N2 - The possible disposal of radioactive waste in Boom Clay will generate perturbations, which can affect the transport parameters values. After NaNO3 leaching from bituminized waste, the ionic strength of the Boom Clay porewater will increase, compressing the electrical double layer and resulting in a higher diffusion accessible porosity of anions.
Migration experiments are performed with tritiated water (HTO), iodide and H14CO3- in Boom Clay cores, equilibrated with porewater at four different ionic strengths (Boom Clay porewater, 0.1M, 0.5M and 1.0M).
As expected, for HTO the values of R (with R the retardation factor) do not depend on ionic strength, with an average value between 0.38 and 0.40. The average R value of iodide increases with ionic strength: from 0.17 for Boom Clay porewater to 0.28 at 1.0 M. The same trend is observed for H14CO3-. For titriated water and iodide, the retardation factor is supposed to be one. The R values for H14CO3- at 0.5 M and 1.0 M (respectively 0.49 and 0.56), being higher than for tritiated water, can only be explained by a slight retardation (R > 1). The anistropy of the dispersion coefficients is around 2.8.
AB - The possible disposal of radioactive waste in Boom Clay will generate perturbations, which can affect the transport parameters values. After NaNO3 leaching from bituminized waste, the ionic strength of the Boom Clay porewater will increase, compressing the electrical double layer and resulting in a higher diffusion accessible porosity of anions.
Migration experiments are performed with tritiated water (HTO), iodide and H14CO3- in Boom Clay cores, equilibrated with porewater at four different ionic strengths (Boom Clay porewater, 0.1M, 0.5M and 1.0M).
As expected, for HTO the values of R (with R the retardation factor) do not depend on ionic strength, with an average value between 0.38 and 0.40. The average R value of iodide increases with ionic strength: from 0.17 for Boom Clay porewater to 0.28 at 1.0 M. The same trend is observed for H14CO3-. For titriated water and iodide, the retardation factor is supposed to be one. The R values for H14CO3- at 0.5 M and 1.0 M (respectively 0.49 and 0.56), being higher than for tritiated water, can only be explained by a slight retardation (R > 1). The anistropy of the dispersion coefficients is around 2.8.
KW - Ionic strength
KW - HTO
KW - iodide
KW - H14CO3-
KW - Boom Clay
KW - transport parameters
KW - accessible porosity
KW - dispersion coefficient
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_103900
UR - http://knowledgecentre.sckcen.be/so2/bibref/6754
M3 - In-proceedings paper
SN - 978-1-60511-166-7
T3 - Materials Research Society proceedings
SP - 497
EP - 504
BT - Scientific Basis for Nuclear Waste Management XXXIII. Symposium Proceedings. Volume 1193
CY - Warrendale, PA, United States
T2 - 33rd International Symposium "Scientific Basis for Nuclear Waste Management". MRS
Y2 - 24 May 2009 through 29 May 2009
ER -