Effects of the presence of pyrite and carbonate minerals on the kinetics of the uranium release from a natural rock |
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Authors: | C Noubactep J Sonnefeld D Merten T Heinrichs M Sauter |
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Institution: | 35201. Centre of Geosciences - Applied Geology, Universit?t G?ttingen, Goldschmidtstrasse 3, D-37077 G?ttingen, Germeny 35202. Institute of Physical Chemistry, Friedrich-Schiller Universit?t Jena, Lessingstrasse 10, D-07743 Jena, Germany 35203. Institute of Earth Sciences, Friedrich-Schiller Universit?t Jena, Burgweg 11, D-07749 Jena, Germany 35204. Centre of Geosciences - Applied Geology, Universit?t G?ttingen, Goldschmidtstrasse 3, D-37077 G?ttingen, Germeny 35205. Centre of Geosciences - Applied Geology, Universit?t G?ttingen, Goldschmidtstrasse 3, D-37077 G?ttingen, Germeny
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Abstract: | Summary The influence of calcite, dolomite, pyrite and vaterite on the kinetics of uranium release from a natural rock under relevant,
i.e., field conditions has been investigated. The time dependence of the U release has been studied in two different experimental
procedures (open and closed systems) at laboratory temperature (21±2 °C). Performing batch experiments in tap water, the U
release efficiency of a natural U-bearing rock was characterized in the presence of varying amounts of three different carbonate
bearing minerals for experimental durations of up to 782 days. Another experiment was conducted for a period of 14 days in
the presence of a pyrite mineral. The results demonstrate that the presence of carbonate minerals does not have any significant
influence on U release in closed systems where the U concentration at saturation was ca. 54 mg/l. In contrast, in open systems,
the U concentration was ca. 8 mg/l at saturation and the effects of all additives both on kinetics and saturation concentration
of U were apparent. |
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