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@ARTICLE{Finck:111944,
      author       = {Finck, N. and Dardenne, K. and Bosbach, D. and Geckeis, H.},
      title        = {{S}elenide {R}etention by {M}ackinawite},
      journal      = {Environmental science $\&$ technology},
      volume       = {46},
      issn         = {0013-936X},
      address      = {Columbus, Ohio},
      publisher    = {American Chemical Society},
      reportid     = {PreJuSER-111944},
      pages        = {10004 - 10011},
      year         = {2012},
      note         = {Record converted from VDB: 16.11.2012},
      abstract     = {The isotope (79)Se may be of great concern with regard to
                      the safe disposal of nuclear wastes in deep geological
                      repositories due to its long half-life and potential
                      mobility in the geosphere. The Se mobility is controlled by
                      the oxidation state: the oxidized species (Se(IV)) and
                      (Se(VI)) are highly mobile, whereas the reduced species
                      (Se(0) and Se(-II)) form low soluble solids. The mobility of
                      this trace pollutant can be greatly reduced by interacting
                      with the various barriers of the repository. Numerous
                      studies report on the oxidized species retention by mineral
                      phases, but only very scarce studies report on the selenide
                      (Se(-II)) retention. In the present study, the selenide
                      retention by coprecipitation with and by adsorption on
                      mackinawite (FeS) was investigated. XRD and SEM analyses of
                      the samples reveal no significant influence of Se on the
                      mackinawite precipitate morphology and structure. Samples
                      from coprecipitation and from adsorption are characterized
                      at the molecular scale by a multi-edge X-ray absorption
                      spectroscopy (XAS) investigation. In the coprecipitation
                      experiment, all elements (S, Fe, and Se) are in a low ionic
                      oxidation state and the EXAFS data strongly point to
                      selenium located in a mackinawite-like sulfide environment.
                      By contacting selenide ions with FeS in suspension, part of
                      Se is located in an environment similar to that found in the
                      coprecipitation experiment. The explanation is a dynamical
                      dissolution-recrystallization mechanism of the highly
                      reactive mackinawite. This is the first experimental study
                      to report on selenide incorporation in iron monosulfide by a
                      multi-edge XAS approach.},
      cin          = {IEK-6},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {Nukleare Sicherheitsforschung},
      pid          = {G:(DE-Juel1)FUEK404},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22900520},
      UT           = {WOS:000308787800024},
      doi          = {10.1021/es301878y},
      url          = {https://juser.fz-juelich.de/record/111944},
}