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@ARTICLE{Vanderborght:441,
      author       = {Vanderborght, J. and Gahwiller, P. and Flühler, M. O.},
      title        = {{I}dentification of transport processes in soil cores using
                      fluorescent tracers},
      journal      = {Soil Science Society of America journal},
      volume       = {66},
      issn         = {0361-5995},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-441},
      pages        = {774 - 787},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {To identify soil properties that control transport of
                      adsorbing solutes in natural soil, we carried out leaching
                      experiments in undisturbed soil cores taken from three soil
                      layers of a Stagni-Humic Cambisol. Breakthrough curves
                      (BTCs) of Cl- and two adsorbing fluorescent dye tracers,
                      brilliant sulfaflavine (BF;
                      1H-Benz(de)isoquinoline-5-sulfonic acid,
                      2,3-dihydro-6-aniino-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), were measured. Three cores were scanned with
                      x-rays to determine the three-dimensional (3-D) structure of
                      large pores. After the leaching experiment, soil cores were
                      horizontally sliced and dye concentration distributions on
                      cross sections were derived from fluorescence signal images.
                      Transport was investigated using BTCs and concentration
                      maps, adsorption isotherms., and predictions by three
                      different transport models: convection dispersion model
                      (CDM), stream tube model (STM) and physical nonequilibrium
                      model (PNEM). The dense network of large pores in the two
                      upper soil layers induced a uniform lateral spreading of
                      dyes and the CDM described the transport fairly well. In
                      cores from the deeper layer, the large pore network was
                      considerably less dense and dye patterns followed closely
                      the few large pores without lateral mixing indicating
                      preferential flow and explaining the fast dye breakthrough.
                      Predictions by the STM revealed that the fast SB
                      breakthrough could not be explained solely by preferential
                      flow. Fitting the PNEM to breakthrough data and the low
                      total dye concentration in the preferential flow region
                      suggested a small sorption capacity of the preferential flow
                      region for SB. Therefore, preferential leaching of dyes
                      resulted from small-scale variations in physical and
                      chemical soil properties.},
      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:000175288300012},
      url          = {https://juser.fz-juelich.de/record/441},
}