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@PHDTHESIS{Gottselig:811341,
      author       = {Gottselig, Nina},
      title        = {{T}he {R}ole of {N}atural {N}anoparticles and {C}olloids
                      for {P}hosphorus {B}inding in {F}orested {H}eadwater
                      {C}atchments},
      volume       = {330},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2016-03828},
      isbn         = {978-3-95806-160-6},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {VIII, 116 S.},
      year         = {2016},
      note         = {RWTH Aachen, Diss., 2016},
      abstract     = {Stream waters reflect the natural load of nutrients and
                      minerals cycled within or released from ecosystems; yet,
                      little is known about natural colloids (1-1000 nm) and
                      especially nanoparticles (NNP, 1-100 nm) as nutrient
                      carriers in the complex biogeochemical system of forested
                      headwater catchments. NNP and colloids are recognized as
                      ubiquitous components in natural aqueous phases and have the
                      potential to encapsulate and bind nutrients, yet are often
                      not included in the analysis of terrestrial nutrient cycling
                      processes. The distribution of elements between the
                      different physicochemical forms in solution is an important
                      precursor to understand the mechanisms of ecosystem
                      nutrition, especially for limiting nutrients like phosphorus
                      (P). The size and composition of NNP and colloids in aqueous
                      phases is therefore relevant for the transport of essential
                      nutrients like P.Asymmetric Flow Field Flow Fractionation
                      (AF4) was coupled online to a UV detector for approximation
                      of organic C, a dynamic light scattering device for
                      recording of the hydrodynamic particle diameter, a
                      quadrupole inductively coupled plasma mass spectrometer with
                      collision cell technology (ICP-MS) for elemental
                      size-resolved detection and to an organic carbon detector
                      (OCD) for high sensitive size-resolved organic carbon
                      detection. Method development of hyphenated AF4 was
                      performed whereas online P detection represented a specific
                      challenge due to the low concentrations in many natural
                      waters. Methodological considerations on the oxidation
                      efficiency of OCD, the capability of ICP-MS to detect
                      organic C and on a setup to be able to determine the
                      bioavailability of NNP and colloid bound P were assessed.
                      Stream waters of forested headwater catchments were sampled
                      as representative medium for mobile components in
                      ecosystems. To assess a more universally valid role of NNP
                      and colloids, an upscaling approach of the catchment based
                      analysis was chosen from regional to national to continental
                      scale.The aim of the regional sampling study was to
                      characterize NNP and colloidal bound P of distinct
                      hydromorphological areas in stream water of the Wüstebach
                      catchment. The NNP and colloidal P could be fractionated in
                      two size fractions (2-20 nm and >20-300 nm), which
                      constituted up to $100\%$ of the total river P discharge
                      depending on hydromorphology. For the small size fraction,
                      variations in P concentrations followed the Al variations;
                      in addition, a high Fe presence in both fractions was
                      accompanied by high P concentrations. Moreover, organic C
                      was approximated together with P in the presence of Fe and
                      Al, suggesting that Fe and Al are potential carriers of P
                      and associated with organic matter. Tracing the origin of
                      NNP and colloid fractions revealed mixed inputs from soil
                      and vegetation of the catchment. The data enables the inputs
                      and source regions of NNP and colloidal fractions to be
                      traced and conceptually defined for the first time within a
                      small river of a headwater catchment. [...]},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2016092826},
      url          = {https://juser.fz-juelich.de/record/811341},
}