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@ARTICLE{Tang:911174,
      author       = {Tang, Ni and Siebers, Nina and Leinweber, Peter and
                      Eckhardt, Kai-Uwe and Dultz, Stefan and Nischwitz, Volker
                      and Klumpp, Erwin},
      title        = {{I}mplications of {F}ree and {O}ccluded {F}ine {C}olloids
                      for {O}rganic {M}atter {P}reservation in {A}rable {S}oils},
      journal      = {Environmental science $\&$ technology},
      volume       = {56},
      number       = {19},
      issn         = {0013-936X},
      address      = {Columbus, Ohio},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2022-04486},
      pages        = {14133 - 14145},
      year         = {2022},
      note         = {Kein Post-print vorhanden},
      abstract     = {Colloidal organo–mineral associations contribute to soil
                      organic matter (OM) preservation and mainly occur in two
                      forms: (i) as water-dispersible colloids that are
                      potentially mobile (free colloids) and (ii) as building
                      units of soil microaggregates that are occluded inside them
                      (occluded colloids). However, the way in which these two
                      colloidal forms differ in terms of textural characteristics
                      and chemical composition, together with the nature of their
                      associated OM, remains unknown. To fill these knowledge
                      gaps, free and occluded fine colloids <220 nm were isolated
                      from arable soils with comparable organic carbon (Corg) but
                      different clay contents. Free colloids were dispersed in
                      water suspensions during wet-sieving, while occluded
                      colloids were released from water-stable aggregates by
                      sonication. The asymmetric flow field-flow fractionation
                      analysis on the free and occluded colloids suggested that
                      most of the 0.6–220 nm fine colloidal Corg was present in
                      size fractions that showed high abundances of Si, Al, and
                      Fe. The pyrolysis-field ionization mass spectrometry
                      revealed that the free colloids were relatively rich in less
                      decomposed plant-derived OM (i.e., lipids, suberin, and free
                      fatty acids), whereas the occluded colloids generally
                      contained more decomposed and microbial-derived OM (i.e.,
                      carbohydrates and amides). In addition, a higher thermal
                      stability of OM in occluded colloids pointed to a higher
                      resistance to further degradation and mineralization of OM
                      in occluded colloids than that in free colloids. This study
                      provides new insights into the characteristics of subsized
                      fractions of fine colloidal organo–mineral associations in
                      soils and explores the impacts of free versus occluded
                      colloidal forms on the composition and stability of
                      colloid-associated OM.},
      cin          = {ZEA-3 / IBG-3},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)ZEA-3-20090406 / 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},
      pubmed       = {36108131},
      UT           = {WOS:000861929900001},
      doi          = {10.1021/acs.est.2c01973},
      url          = {https://juser.fz-juelich.de/record/911174},
}