Abstract
De-acidification of acid mine waters transfers dissolved uranium into a colloidal form. Spectroscopic studies on colloid-borne uranium obtained by simulation of mine flooding in the laboratory showed that matrix ions such as sulfate and silicate are not involved in inner-sphere surface sorption complexes of UO22+ on ferrihydrite. At ambient air atmosphere, the data suggest the formation of ternary U(VI) carbonato surface complexes with either monodentate or bidentate coordination of carbonate and uranyl even at moderately acidic conditions. A revised model is proposed for UO22+ sorption on ferrihydrite in the absence of carbonate.
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Ulrich, KU., Rossberg, A., Scheinost, A.C., Foerstendorf, H., Zänker, H., Jenk, U. (2006). Speciation of Colloid-borne Uranium by EXAFS and ATR-FTIR spectroscopy. In: Merkel, B.J., Hasche-Berger, A. (eds) Uranium in the Environment. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-28367-6_13
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DOI: https://doi.org/10.1007/3-540-28367-6_13
Publisher Name: Springer, Berlin, Heidelberg
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