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@ARTICLE{Lange:1039728,
      author       = {Lange, Steve and Isaacs, Matthew and Klinkenberg, Martina
                      and Read, David and Bosbach, Dirk and Deissmann, Guido},
      title        = {{U}ptake of iodine by cement hydration phases:
                      {I}mplications for radioactive waste disposal},
      journal      = {Applied geochemistry},
      volume       = {181},
      issn         = {0883-2927},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2025-01772},
      pages        = {106301},
      year         = {2025},
      abstract     = {Iodine-129 (129I) is an important radionuclide in the
                      context of nuclear waste disposal owing to its long
                      half-life and potentially high mobility in the environment.
                      The uptake of iodide and iodate by cement hydration phases,
                      including calcium silicate hydrates (CSH), AFm and
                      ettringite, as well as hardened cement paste made from
                      Ordinary Portland cement, has been studied in batch-type
                      sorption experiments to enhance understanding of iodine
                      retention mechanisms in engineered repositories. Uptake
                      kinetics were enerally fast, leading to steady state within
                      30 days. Strong uptake of iodine by AFm and ettringite was
                      observed, the mechanism dependent on the iodine speciation.
                      Iodide is retained in both AFm and ettringite by exchange
                      for sulphate, whereas with iodate, iodate-substituted
                      ettringite is formed by phase transformation or ion exchange
                      in the case of AFm and ettringite, respectively. The
                      contribution of CSH phases to iodine retention in
                      cementitious systems depends on the Ca/Si-ratio of the CSH
                      and the alkalinity of the solution, with stronger retention
                      in young hyperalkaline cementitious materials. These
                      findings have implications when selecting grouts for the
                      immobilisation of radioactive waste streams containing 129I
                      or for choosing cementitious grouts and/or backfill
                      materials in nuclear waste repositories.},
      cin          = {IFN-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IFN-2-20101013},
      pnm          = {1411 - Nuclear Waste Disposal (POF4-141) / Cebama -
                      Cement-based materials, properties, evolution, barrier
                      functions (662147)},
      pid          = {G:(DE-HGF)POF4-1411 / G:(EU-Grant)662147},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001433862800001},
      doi          = {10.1016/j.apgeochem.2025.106301},
      url          = {https://juser.fz-juelich.de/record/1039728},
}