%0 Journal article
%A Noubactep, C.
%A Sonnefeld, J.
%A Merten, D.
%A Heinrichs, T.
%A Sauter, M.
%T Effects of the Presence of Pyrite and Carbonate Minerals on the Kinetics of the Uranium Release from a Natural Rock
%R 10.1007/s10967-006-0352-x
%R 10.23689/fidgeo-2484
%J Journal of Radioanalytical and Nuclear Chemistry
%V 270
%N 270

%X The influence of calcite, dolomite, pyrite and vaterite on the kinetics of uranium (U) 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 characterised 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.
%U http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6797
%~  FID GEO-LEO e-docs