Characteristics of uranium uptake of Boda Claystone Formation as the candidate host rock of high level radioactive waste repository in Hungary

Dániel Breitner, János Osán, Margit Fábián, Péter Zagyvai, Csaba Szabó, Rainer Dähn, Maria Marques Fernandes, István E. Sajó, Zoltán Máthé, Szabina Török

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In Hungary two geological sites of the Boda Claystone Formation (BCF) located in the W-Mecsek mountains (South Hungary) have been selected for the study of potential host rocks for high level radioactive waste, Gorica (G) Block and W-Mecsek Anticline (WMA) Block. The aim of the study was to obtain information on the uranium uptake characteristics of both sites. Our results revealed that in the sample, taken from WMA Block, where dolomites have ankerite rims and U-bearing rings, newly formed FeOOH precipitations were observed, which partly replaced the ankerite at near neutral pH (6.8). UO22+ ions were adsorbed easily due to the enhanced specific surface area and high adsorption capacity of FeOOH formed from the dissolution of ankerite. The oxidation of Fe2+ leads to the formation of FeOOH parallel to partial reduction of U6+ to U4+. 75 % of uranium was taken up by clay minerals and 25 % by FeOOH although the ankerite concentration is as low as 6 % in WMA Block of BCF. In G Block, the argillaceous matrix was found to be mainly responsible for the UO22+ uptake. The study demonstrated that the U retention capacity of different BCF locations was significantly influenced by the mineralogy of these sites.

Original languageEnglish
Pages (from-to)209-219
Number of pages11
JournalEnvironmental Earth Sciences
Volume73
Issue number1
DOIs
Publication statusPublished - 2014

Keywords

  • Ankerite
  • Boda Claystone Formation
  • FeOOH
  • Nuclear waste repository
  • Uranium uptake

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Water Science and Technology
  • Soil Science
  • Pollution
  • Geology
  • Earth-Surface Processes

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