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@ARTICLE{Vanderborght:452,
      author       = {Vanderborght, J. and Gahwiller, P. and Wydler, H. and
                      Schultze, U. and Flühler, M. O.},
      title        = {{I}maging fluorescent dye concentrations on soil surfaces :
                      uncertainty of concentration estimates},
      journal      = {Soil Science Society of America journal},
      volume       = {66},
      issn         = {0361-5995},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-452},
      pages        = {760 - 773},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {To investigate transport processes in soils, detailed
                      information about the spatial distribution of solutes is
                      required. We describe a method to obtain concentration maps
                      of fluorescent tracers on cross sections of soil cores with
                      a high spatial resolution. The fluorescence signal of two
                      dye tracers, brilliant sulfaflavine (BF;
                      1-H-Benz(de)isoquinoline-5-sulfonic acid,
                      2,3-dihydro-6-amino-1,3-dioxo-2-(p-tolyl)-, monosodium salt)
                      and sulforhodamine B (SB; xanthylium,
                      3,6-bis(diethylamino)-9-(2,4-disulfophenyl)-, inner salt,
                      sodium salt), was imaged on the exposed cross sections. The
                      fluorescence signal was corrected for variable illumination
                      light intensity and optical properties of the soil across
                      the exposed surface. Correction factors for varying optical
                      soil properties were derived from the image of the reflected
                      excitation light at the exposed surface. Linear calibration
                      relations related the corrected fluorescence image to the
                      total tracer concentration (C-t) map, that is, mass of dye
                      dissolved in the soil solution and sorbed to the soil
                      particles per unit volume bulk soil. Corrections for varying
                      optical properties of the soil surface were important to
                      reduce the uncertainty of the concentration that was
                      estimated from the fluorescence signal. For BF, the
                      calibration relations were different for different soil
                      materials and a soil specific calibration had to be used.
                      Variations in background fluorescence were an important
                      source of uncertainty of the BF concentration estimates but
                      can be overcome by applying higher concentrations. For SB,
                      variations in calibration relations and in the background
                      fluorescence were considerably smaller, and so is the
                      uncertainty of the estimated SB concentrations.},
      keywords     = {J (WoSType)},
      cin          = {ICG-IV},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB50},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Soil Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000175288300011},
      url          = {https://juser.fz-juelich.de/record/452},
}