Articles | Volume 56
https://doi.org/10.5194/adgeo-56-97-2021
https://doi.org/10.5194/adgeo-56-97-2021
09 Nov 2021
 | 09 Nov 2021

Uranium migration through the Swiss Opalinus Clay varies on the metre scale in response to differences of the stability constant of the aqueous, ternary uranyl complex Ca2UO2(CO3)3

Theresa Hennig and Michael Kühn

Related authors

Uranium migration lengths in Opalinus Clay depend on geochemical gradients, radionuclide source term concentration and pore water composition
Theresa Hennig and Michael Kühn
Adv. Geosci., 62, 21–30, https://doi.org/10.5194/adgeo-62-21-2023,https://doi.org/10.5194/adgeo-62-21-2023, 2023
Short summary
Hydrogeochemical impact of Opalinus Clay system shown in migration lengths of uranium
Theresa Hennig and Michael Kühn
Saf. Nucl. Waste Disposal, 2, 147–147, https://doi.org/10.5194/sand-2-147-2023,https://doi.org/10.5194/sand-2-147-2023, 2023
Short summary
Reactive transport simulations of uranium migration in the Opalinus Clay depend on ion speciation governed by underlying thermodynamic data
Theresa Hennig and Michael Kühn
Adv. Geosci., 58, 11–18, https://doi.org/10.5194/adgeo-58-11-2022,https://doi.org/10.5194/adgeo-58-11-2022, 2022
Short summary

Cited articles

Appelo, C. A. J. and Wersin, P.: Multicomponent diffusion modeling in clay systems with application to the diffusion of tritium, iodide, and sodium in opalinus clay, Environ. Sci. Technol., 41, 5002–5007, https://doi.org/10.1021/es0629256, 2007. a, b, c
Appelo, C. A. J., Van Loon, L. R., and Wersin, P.: Multicomponent diffusion of a suite of tracers (HTO, Cl, Br, I, Na, Sr, Cs) in a single sample of Opalinus Clay, Geochim. Cosmochim. Ac., 74, 1201–1219, https://doi.org/10.1016/j.gca.2009.11.013, 2010. a, b, c
Bernhard, G., Geipel, G., Reich, T., Brendler, V., Amayri, S., Nitsche, H., and Nitsche, H.: Uranyl (VI) carbonate complex formation: Validation of the Ca2UO2(CO3)3(aq.) species, Radiochim. Acta, 89, 511–518, https://doi.org/10.1524/ract.2001.89.8.511, 2001. a, b, c, d, e, f, g
Bossart, P. and Thury, M.: Characteristics of the Opalinus Clay at Mont Terri, Reports of the Swiss Geological Survey, 3, 1355-5146, 2008. a
Bradbury, M. H. and Baeyens, B.: Modelling the sorption of Mn(II), Co(II), Ni(II), Zn(II), Cd(II), Eu(III), Am(III), Sn(IV), Th(IV), Np(V) and U(VI) on montmorillonite: Linear free energy relationships and estimates of surface binding constants for some selected heavy metals and actinide, Geochim. Cosmochim. Ac., 69, 875–892, https://doi.org/10.1016/j.gca.2004.07.020, 2005a. a, b
Download
Short summary
Uranium migration in the Swiss Opalinus Clay is used as an example to quantify the influence of varying values of a stability constant in the underlying thermodynamic database within the law of mass action on the migration lengths. The difference of the stability constant of 1.33 log units lead to changed migration lengths of 5 m to 7 m. With a maximum diffusion distance of 22 m the influence of an uncertain stability constant is negligible for the host rock scale.