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@ARTICLE{Khalaf:30959,
      author       = {Khalaf, M. and Kohl, S. and Klumpp, E. and Rice, J. and
                      Tombácz, E.},
      title        = {{C}omparison of {S}orption {D}omains in {M}olecular
                      {W}eight {F}ractions of a {S}oil {H}umic {A}cid {U}sing
                      {S}olid-{S}tate 19{F} {NMR}},
      journal      = {Environmental Science $\&$ Technology},
      volume       = {37},
      issn         = {0013-936X},
      address      = {Columbus, Ohio},
      publisher    = {American Chemical Society},
      reportid     = {PreJuSER-30959},
      pages        = {2855 - 2860},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Humic acid was fractionated into eight different molecular
                      size components using ultrafiltration. Solid-state CPMAS
                      C-13 NMR demonstrated that fractions larger than 100 000
                      Daltons were primarily aliphatic in character,while
                      fractions smaller than 30 000 Daltons were predominantly
                      aromatic in character. Solid-state F-19 NMR examination of
                      the sorptive uptake of hexafluorobenzene (HFB) by HA and
                      each of the fractions gave spectroscopic evidence for the
                      existence of at least three sorption sites in the smaller
                      molecular size fractions, while two predominant sorption
                      sites could be established in the larger molecular size
                      fractions. Sorbed HFB displayed higher mobility in the
                      smaller, more aromatic fractions while HFB in the larger,
                      more aliphatic fractions displayed lower mobility. The
                      relative mobilities of HFB in each sorption domain suggest
                      that the rigid domain may be composed of aliphatic carbon
                      rather than aromatic carbon moieties. In larger size
                      fractions, this domain may be the result of rigid, glassy
                      regions composed of aliphatic molecules or side chains.},
      keywords     = {J (WoSType)},
      cin          = {ICG-IV},
      ddc          = {050},
      cid          = {I:(DE-Juel1)VDB50},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Engineering, Environmental / Environmental Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000183973700023},
      doi          = {10.1021/es0206386},
      url          = {https://juser.fz-juelich.de/record/30959},
}