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@ARTICLE{Jiang:276176,
      author       = {Jiang, Xiaoqian and Bol, Roland and Nischwitz, Volker and
                      Siebers, Nina and Willbold, Sabine and Vereecken, Harry and
                      Amelung, Wulf and Klumpp, Erwin},
      title        = {{P}hosphorus {C}ontaining {W}ater {D}ispersible
                      {N}anoparticles in {A}rable {S}oil},
      journal      = {Journal of environmental quality},
      volume       = {44},
      number       = {6},
      issn         = {0047-2425},
      address      = {Madison, Wis.},
      publisher    = {ASA [u.a.]},
      reportid     = {FZJ-2015-06643},
      pages        = {1772-1781},
      year         = {2015},
      abstract     = {Due to the limited solubility of phosphorus (P) in soil,
                      understanding its binding in fine colloids is vital to
                      better forecast P dynamics and losses in agricultural
                      systems. We hypothesized that water-dispersible P is present
                      as nanoparticles and that iron (Fe) plays a crucial role for
                      P binding to these nanoparticles. To test this, we isolated
                      water-dispersible fine colloids (WDFC) from an arable
                      topsoil (Haplic Luvisol, Germany) and assessed colloidal P
                      forms after asymmetric flow field-flow fractionation coupled
                      with ultraviolet and an inductively coupled plasma mass
                      spectrometer, with and without removal of amorphous and
                      crystalline Fe oxides using oxalate and dithionite,
                      respectively. We found that fine colloidal P was present in
                      two dominant sizes: (i) in associations of organic matter
                      and amorphous Fe (Al) oxides in nanoparticles <20 nm, and
                      (ii) in aggregates of fine clay, organic matter and Fe
                      oxides (more crystalline Fe oxides) with a mean diameter of
                      170 to 225 nm. Solution 31P-nuclear magnetic resonance
                      spectra indicated that the organically bound P predominantly
                      comprised orthophosphate-monoesters. Approximately $65\%$ of
                      P in the WDFC was liberated after the removal of Fe oxides
                      (especially amorphous Fe oxides). The remaining P was bound
                      to larger-sized WDFC particles and Fe bearing phyllosilicate
                      minerals. Intriguingly, the removal of Fe by dithionite
                      resulted in a disaggregation of the nanoparticles, evident
                      in higher portions of organically bound P in the <20 nm
                      nanoparticle fraction, and a widening of size distribution
                      pattern in larger-sized WDFC fraction. We conclude that the
                      crystalline Fe oxides contributed to soil P sequestration by
                      (i) acting as cementing agents contributing to soil fine
                      colloid aggregation, and (ii) binding not only inorganic but
                      also organic P in larger soil WDFC particles.},
      cin          = {IBG-3 / ZEA-3},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-3-20090406},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000364912300009},
      pubmed       = {pmid:26641329},
      doi          = {10.2134/jeq2015.02.0085},
      url          = {https://juser.fz-juelich.de/record/276176},
}