Abstract
Numerical flow simulations with common hydraulic conductivity/depth distributions result in an active and passive turn-over zone, both occurring world wide. Geochemical modeling of uranium species distribution under oxidizing conditions in carbonate and sulfate waters mostly yields negatively charged or neutral UO2-carbonate complexes, which do not sorbe on negatively charged mineral surfaces (pH 5 to 8), which is in good agreement with batch experiments. Contrary, in crystalline aquifers Uranium species are mostly positively charged, favoring sorption. Dilution in the passive turn-over zone is dominated by transverse hydro-dynamic dispersion and gets enhanced by orders of magnitudes in bi-porous sediments through matrix diffusion. At the transition from the passive into the active turn-over zone dilution gets further enhanced.
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© 2002 Springer-Verlag Berlin Heidelberg
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Seiler, K.P., Graf, W., Lang, H., Zapata, R. (2002). Groundwater flow systems and the export of uranium from nuclear waste repositories to the biosphere. In: Merkel, B.J., Planer-Friedrich, B., Wolkersdorfer, C. (eds) Uranium in the Aquatic Environment. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55668-5_25
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DOI: https://doi.org/10.1007/978-3-642-55668-5_25
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