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@ARTICLE{Klinkenberg:902246,
      author       = {Klinkenberg, Martina and Brandt, Felix and Baeyens, Bart
                      and Bosbach, Dirk and Fernandes, Maria Marques},
      title        = {{A}dsorption of barium and radium on montmorillonite: {A}
                      comparative experimental and modelling study},
      journal      = {Applied geochemistry},
      volume       = {135},
      issn         = {0883-2927},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-04116},
      pages        = {105117 -},
      year         = {2021},
      abstract     = {The widely favored option for the safe storage of
                      high-level radioactive waste is a multi-barrier disposal
                      system with clay-based geotechnical barriers e.g. bentonite.
                      Montmorillonite as a major constituent of bentonite (up to
                      90 $wt.-\%)$ is an important sink for potentially released
                      radionuclides. The adsorption of 226Ra and Ba on
                      Na-montmorillonite (SWy-2) was investigated as function of
                      pH (edges) and of Ba concentration (isotherms) at different
                      ionic strengths. Ba is often used as a chemical analogue for
                      226Ra due to their closely related physical and chemical
                      properties e.g. the formation of complete Ba/Ra solid
                      solutions. The experimental Ba/Ra adsorption data could be
                      quantitatively described by considering cation exchange
                      reactions on the planar sites of montmorillonite. To
                      describe the pH dependent adsorption of Ba and Ra at high
                      ionic strength and high pH, an additional reaction involving
                      surface complexation was necessary. The fitted selectivity
                      coefficients (Kc) for the cation exchange of Ba and Ra with
                      respect to Na are very similar at low ionic strength (0.02
                      M), whereas at higher ionic strength (0.3 M), Ra appears to
                      be more selective.},
      cin          = {IEK-6},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {1411 - Nuclear Waste Disposal (POF4-141)},
      pid          = {G:(DE-HGF)POF4-1411},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000720474600003},
      doi          = {10.1016/j.apgeochem.2021.105117},
      url          = {https://juser.fz-juelich.de/record/902246},
}