Journal
RADIOCHIMICA ACTA
Volume 95, Issue 12, Pages 709-716Publisher
OLDENBOURG VERLAG
DOI: 10.1524/ract.2007.95.12.709
Keywords
-
Ask authors/readers for more resources
Technetium-99 is a beta-emitting fission product of U-238. It is important when considering a safety case for nuclear waste disposal because of its high yield in radioactive waste and long half-life. The aqueous chemistry of Tc in a cementitious repository is likely to be dominated by Tc(VII), as TcO4-, in aerobic areas and by Tc(IV), as TcO2 (am), in anaerobic. Some previous studies have shown an increase in Tc(IV) solubility with increasing pH above pH 9.5 whilst others have not observed this increase. This study found that the solubility of Tc(IV) remains independent of pH until around 13.5, when a small increase can be seen which continues to increase linearly with pH. Modelling suggests that this increase occurs as the species TcO(OH)(3)(-) is formed. The formation constant was estimated with data from this study and was found to be log K-2= -21.6 +/- 0.3.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available