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@ARTICLE{Mojid:47403,
      author       = {Mojid, M. A. and Vereecken, H.},
      title        = {{M}odeling velocity and retardation factor of a nonlinearly
                      sorbing solute plume},
      journal      = {Soil research},
      volume       = {43},
      issn         = {0004-9573},
      address      = {Collingwood, Victoria},
      publisher    = {CSIRO},
      reportid     = {PreJuSER-47403},
      pages        = {735 - 743},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {This study, considering evidences of slower sorption rates
                      of reactive solutes in the field than in laboratory,
                      quantifies the velocity and retardation factor of a sodium
                      fluorescein (uranin: C20H10Na2O5) plume over its travel path
                      in a heterogeneous aquifer. The transport process of uranin
                      was evaluated by batch experiments and from breakthrough
                      curves (BTCs) by using solute-transport models. Method of
                      time moments analysed BTCs of uranin and bromide to derive
                      the velocity and retardation factor.A constant velocity of
                      the bromide plume, 0.64 m/day, implies a spatially and
                      temporally uniform velocity field where groundwater flows at
                      steady-state condition. A large dimensionless index (195) of
                      chemical non-equilibrium model and equilibrium distribution
                      coefficient (0.32) of uranin are indicative of chemical
                      non-equilibrium transport process.The travel time of uranin
                      plume increases asymptotically, following power law, with
                      travel path of the plume. Good agreement of the exponent of
                      power law with that of Freundlich isotherm is a result of
                      nonlinear sorption, and provides an independent way of
                      estimating the exponent of the isotherm. The local velocity
                      of the plume decreases asymptotically in time and is
                      predicted by the derivative of the relationship between
                      travel path and travel time of the plume. The retardation
                      factor, which increases in time following power law, when
                      estimated from the local velocity, is considerably larger
                      than that estimated from travel time of the plume.},
      keywords     = {J (WoSType)},
      cin          = {ICG-IV},
      ddc          = {630},
      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:000232033500007},
      doi          = {10.1071/SR04111},
      url          = {https://juser.fz-juelich.de/record/47403},
}