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@ARTICLE{Konrad:1050433,
      author       = {Konrad, Alexander and Mulder, Ines and Hofmann, Diana and
                      Lang, Friederike and Stutz, Kenton P. and Siemens, Jan},
      title        = {{T}hermodynamics of {O}rganic {A}cid {S}orption to
                      {G}oethite},
      journal      = {European journal of soil science},
      volume       = {77},
      number       = {1},
      issn         = {0022-4588},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2026-00203},
      pages        = {e70278},
      year         = {2026},
      abstract     = {Adsorption to minerals is a key mechanism in stabilizing
                      organic carbon in soils. We used isothermal titration
                      calorimetry (ITC) to quantify the thermodynamics of binding
                      of citric acid, oxalic acid, and salicylic acid to four
                      goethites with different specific surface areas (SSA,
                      14–120 m2 g−1). Thermodynamic parameters could be
                      determined for sorption of citric and salicylic acids, while
                      flocculation of particles prevented their quantification for
                      sorption of oxalic acid. For citric acid adsorption, ∆H
                      shifted from −23.5 ± 0.57 to −27.0 ± 0.47 kJ
                      mol−1 and ∆S from −8.8 ± 1.54 to
                      −29.9 ± 0.13 J mol−1 K−1 with increasing
                      SSA and broader (110) diffraction peaks of goethite, thus
                      reducing ∆G from −20.7 ± 0.02 to
                      −18.0 ± 0.03 kJ mol−1. Salicylic acid adsorption
                      was more exothermic (∆H −40.53 ± 1.93 kJ mol−1)
                      and accompanied by a larger loss of entropy (∆S
                      −65.1 ± 1.91 J mol−1 K−1), possibly due to
                      chelation of its ortho hydroxyl and carboxyl groups to
                      single iron atoms on the mineral surface. These results
                      demonstrate that ITC can decipher adsorption thermodynamics
                      of organic ligands to mineral surfaces, but ligand-induced
                      flocculation can render the interpretation of results
                      difficult. Crystallite size and lattice defects of adsorbent
                      minerals influence the thermodynamics of sorption by
                      determining the conformation of organic molecules sorbed to
                      goethite surfaces.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001659114000001},
      doi          = {10.1111/ejss.70278},
      url          = {https://juser.fz-juelich.de/record/1050433},
}