Effect of Mg-Ca-Sr on the Sorption Behavior of Uranium(VI) on Silica
The effect of alkaline earth uranyl carbonate complexes on the sorption behavior of U(VI) on quartz was studied by means of well defined batch experiments. In the pure U(VI) – silica system, the pH dependency was minor and about 90% of the uranium sorbed onto quartz. However, in the presence of Ca, Sr, or Mg the sorption of uranium decreased to 10, 30, and 50% respectively. The reduction in sorption behavior is due to the presence of zero valent and anionic complexes of alkaline earth uranyl carbonate species and show the importance to include these species in thermodynamic data bases. It is assumed that, in particular, the zero-valent species are responsible for less sorption in the presence of alkaline earth metals.
KeywordsAlkaline Earth Uranium Concentration Sorption Behavior Alkaline Earth Element Hanging Mercury Drop Electrode
- Benedikt G (2007) 797 VA Computrace – voltammetric trace determination of uranium(VI) in drinking and mineral water. Metrohm Information Issue 2/2007. Metrohm Ltd.,CH9101 Herisau, Switzerland. 36Google Scholar
- Grenthe I, Fuger J, Konings R, Lemire RJ, Muller AB, Wanner J (2007) The Chemical Thermodynamics of Uranium. Elsevier: New YorkGoogle Scholar
- Merkel BJ, Nair S (2011) Impact of speciation and Sorption on migration of uranium in groundwater. Nachhaltigkeit und Langzeitaspekte bei der Sanierung von Uranbergbau und Aufbereitungsstandorten. Proceedings des Internationalen Bergbausymposiums WISSYM_2011, Ronneburg, Germany, p 269–274Google Scholar
- Parkhurst DL, Appelo CA (1999) User’s Guide to PHREEQC (version 2). A Computer Program for Speciation, Batch-Reaction, One-Dimensional Transport, and Inverse Geochemical Calculation. U.S.G.S., Water Resources Investigation Report 99–4259Google Scholar
- Stamberg K, Venkatesan KA, Rao PRV (2003) Surface complexation modeling of uranyl ion sorption on mesoporous silica. Colloids and Surfaces aPhysicochemical and Engineering Aspects 221:149–162Google Scholar