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@ARTICLE{Pohlmeier:38319,
      author       = {Pohlmeier, A. and Lustfeld, H.},
      title        = {{R}eaction rates of heavy metal ions at geoethite:
                      relaxation experiments and modeling},
      journal      = {Journal of colloid and interface science},
      volume       = {269},
      issn         = {0021-9797},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-38319},
      pages        = {131 - 142},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {In the present paper we extend our theory that calculates
                      the fastest reaction step observable in suspensions
                      containing charged micro-crystals and heavy metal cations.
                      The calculation requires the solution of the nonlinear
                      Poisson-Boltzmann equation for nonsymmetric electrolytes
                      plus the Nernst-Planck equation for transport of ions in
                      electric fields. We find that the diffusional transport of
                      ions to and from the surface is the rate-limiting process
                      for our experimentally observed maximum rates. At low pH and
                      low metal ion concentration the diffusion of metal ions is
                      the rate-limiting step, whereas for high pH and high metal
                      ion concentration the diffusion of the solvated protons
                      controls the overall relaxation rate. The validity of this
                      theory is checked for the reactions of Pb2+ and Cd2+ with
                      goethite by means of pressure jump relaxation experiments
                      over a wide range of temperature and pH. In all cases we
                      observe fast processes (relaxation in the range of 10(3)
                      s(-1)) in quantitative agreement with the theory, followed
                      by slower processes, most probably caused by diffusion into
                      the interior of the porous microcrystals. (C) 2003 Elsevier
                      Inc. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IFF-TH-I / ICG-IV},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB30 / I:(DE-Juel1)VDB50},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Chemistry, Physical},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000187574400018},
      doi          = {10.1016/j.jcis.2003.07.043},
      url          = {https://juser.fz-juelich.de/record/38319},
}