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

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

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.

Original languageEnglish
Title of host publicationSpringer Geology
PublisherSpringer
Pages635-642
Number of pages8
DOIs
StatePublished - 1 Jan 2012

Publication series

NameSpringer Geology
ISSN (Print)2197-9545
ISSN (Electronic)2197-9553

Keywords

  • High Level Waste
  • Ideal Solid Solution
  • Pitzer Parameter
  • Precipitation Experiment
  • Solid Solution Composition

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