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@ARTICLE{Tombacz:36028,
      author       = {Tombacz, E. and Libor, Z. and Illes, E. and Majzik, A. and
                      Klumpp, E.},
      title        = {{T}he role of reactive surface sites and complexation by
                      humic acids in the interaction of clay mineral and iron
                      oxide particles},
      journal      = {Organic geochemistry},
      volume       = {35},
      issn         = {0146-6380},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-36028},
      pages        = {257 - 267},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Aggregation and dispersion of mineral particles
                      spontaneously take place under changing environmental
                      conditions in natural systems. The structure of particle
                      network in soils, the retardation or release of colloidal
                      particles, and their mobility and transport are inherently
                      influenced by natural organic matter bound to the mineral
                      matrix. Since the surface properties of clay mineral and
                      metal oxide particles, and the electrified mineral-water
                      interfaces play a major role in formation, structure and
                      strength of aggregates, any surface modification, especially
                      by polyanionic organic complexants such as humic substances,
                      has a significant affect on particle interaction in a
                      mineral assemblage. The permanently and/or conditionally
                      charged clay minerals (montmorillonite and kaolinite) and
                      iron oxides (hematite and magnetite), as known major mineral
                      components in natural waters, were selected for studying
                      their surface charge characteristics and pH dependent
                      interactions. We discuss how the surface charge correlates
                      with particle aggregation through some characteristic
                      examples for homo and heterocoagulation of similar and
                      dissimilar mineral particles under acidic condition (at pH
                      similar to4) in the dilute and concentrated systems studied
                      by means of light scattering and theology, respectively. The
                      adsorption of a brown coal derived humic acid, and its
                      influence on the surface charge character and particle
                      aggregation of clay and iron oxide particles were also
                      studied in dilute and concentrated suspensions. Humic acids
                      can be bound to the most reactive surface sites of clay and
                      oxide particles, i.e. to Al-OH mainly at the edges of clay
                      lamellae, and to Fe-OH on iron oxides, in surface
                      complexation reaction, therefore their role in particle
                      aggregation is specific. Relations between surface
                      complexation, surface charge modification, and particle
                      aggregation in pure and mixed montmorillonite-iron oxide
                      systems are explained. (C) 2003 Elsevier Ltd. All rights
                      reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-IV},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB50},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Geochemistry $\&$ Geophysics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000220523800004},
      doi          = {10.1016/j.orggeochem.2003.11.002},
      url          = {https://juser.fz-juelich.de/record/36028},
}