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Formation of (Ba,Ra)SO4 Solid Solutions – Results from Barite (Re)Precipitation and Coprecipitation Experiments

  • Volker Metz
  • Yoav O. Rosenberg
  • Dirk Bosbach
  • Melanie Böttle
  • Jiwchar Ganor
Chapter
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Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Retention of 226Ra2+ by barite in aqueous solution is studied in a barite (re)precipitation experiment with 226Ra2+ doped barite suspensions at I = 0.1 mol·(kg H2O)–1 at ambient temperature. After about two years a steady state is achieved, demonstrating that 226Ra2+(aq) concentration is controlled by the solubility of a (Ba,Ra)SO4 solid solution and several orders of magnitude below the Ra2+ solubility with respect to a pure RaSO4(s) endmember. Results of the barite (re)precipitation experiment are compared to recent (Ba,Ra)SO4 coprecipitation experiments by Rosenberg and co-workers at ionic strength I = 0.7 – 7.0 mol·(kg H2O)−1.

Keywords

High Level Waste Precipitation Experiment Solid Solution Composition Pitzer Parameter Ideal Solid Solution 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Volker Metz
    • 1
  • Yoav O. Rosenberg
    • 2
  • Dirk Bosbach
    • 3
  • Melanie Böttle
    • 1
  • Jiwchar Ganor
    • 2
  1. 1.Institute for Nuclear Waste Disposal (INE)Karlsruhe Institute of TechnologyEggenstein-LeopoldshafenGermany
  2. 2.Department of Geological and Environmental SciencesBen-Gurion University of the NegevBeer ShevaIsrael
  3. 3.Institute of Energy and Climate Research – Safety Research and Reactor Technology (IEK-6)Research Centre JülichJülichGermany

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