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@ARTICLE{Klauth:62967,
      author       = {Klauth, P. and Joschko, A. and Ustohal, P. and Büddefeld,
                      J. and Klumpp, E. and Vereecken, H. and Lezhnina, M. and
                      Kynast, U.},
      title        = {{L}ight fiber optic probe for measuring internal
                      breakthrough of rare earth ion-labelled microspheres in
                      porous media under unsaturated conditions},
      journal      = {Colloids and surfaces / A},
      volume       = {325},
      issn         = {0927-7757},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-62967},
      pages        = {173 - 179},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Application of minimally invasive probes for measuring
                      fluorescent labelled colloids inside sand columns resulted
                      in internal breakthrough curves at given points, that
                      provided information about mass distributions without
                      disrupting the column. Until now, light fiber optic probes
                      were used in combination with organic fluorophores like
                      fluoresceine or rhodamine, which have inherent disadvantage,
                      such as comparably small Stoke's shifts and quenching at
                      high concentrations. These may be overcome using rare earth
                      ion complexes to label colloidal particles like microspheres
                      (MS). Furthermore, these dyes have large fluorescent
                      lifetimes compared to organic fluorophores, which readily
                      allows the elimination of background fluorescence using
                      time-resolved spectroscopy. We demonstrate the novel
                      application of rare earth ionlabelled microspheres as
                      colloidal tracers in column experiments under unsaturated
                      conditions in porous media in coupling with a detection
                      setup based on internal light fiber optic probes.
                      Differences in mass budgets between internal detection and
                      detection at the outlet were confirmed afterwards by
                      invasive refurbishment of the column matrix. (c) 2008
                      Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4 / JARA-ENERGY / JARA-SIM},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$ /
                      I:(DE-Juel1)VDB1045},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Chemistry, Physical},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000258990200010},
      doi          = {10.1016/j.colsurfa.2008.05.012},
      url          = {https://juser.fz-juelich.de/record/62967},
}