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@INPROCEEDINGS{Mehmood:172404,
      author       = {Mehmood, Khalid and Hofmann, Diana and Burauel, Peter and
                      Vereecken, Harry and Berns, Anne E.},
      title        = {{C}esium and strontium sorption behavior in amended
                      agricultural soils},
      journal      = {Geophysical research abstracts},
      volume       = {16},
      issn         = {1607-7962},
      address      = {Katlenburg-Lindau},
      publisher    = {Soc.},
      reportid     = {FZJ-2014-05884},
      pages        = {875},
      year         = {2014},
      abstract     = {Biogas digestates and biochar are emerging soil amendments.
                      Biochar is a byproduct of pyrolysis process which isthermal
                      decomposition of biomass to produce syngas and bio-oil. The
                      use of biochar for soil amendment is beingpromoted for
                      higher crop yields and carbon sequestration. Currently, the
                      numbers of biogas plants in Germany areincreasing to meet
                      the new energy scenarios. The sustainability of biogas
                      industry requires proper disposal optionsfor digestate.
                      Biogas digestates being rich in nutrients are beneficial to
                      enhance agricultural productions. Contraryto the agronomical
                      benefits of these organic amendments, their use can
                      influence the mobility and bioavailabilityof soil
                      contaminants due to nutrients competition and high organic
                      matter content. So far, the impact of suchamendments on
                      highly problematic contaminants like radionuclides is not
                      truly accounted for.In the present study,
                      sorption-desorption behavior of cesium and strontium was
                      investigated in three soilsof different origin and texture.
                      Two agricultural soils, a loamy sand and a silty soil, were
                      amended with biocharand digestate in separate experiments,
                      with field application rates of 25 Mg/ha and 34 Mg/ha,
                      respectively. Forcomparison a third soil, a forest soil, was
                      incubated without any amendment. The amendments were mixed
                      intothe top 20 cm of the field soils, resulting in final
                      concentrations of 8-9 g biochar/Kg soil and 11-12 g
                      digestate/Kgsoil. The soils were incubated for about six
                      months at room temperature. Sorption-desorption experiments
                      wereperformed with CsCl and SrCl2 after pre-equilibrating
                      the soils with CaCl2 solutions.The amendments with field
                      application rates did not have a significant effect on the
                      relevant soil parametersresponsible for the sorption
                      behavior of the two radionuclides. Comparatively, the soil
                      type lead to distinctivedifferences in sorption-desorption
                      dynamics of the two radionuclides. Cesium showed a higher
                      affinity for siltysoil followed by forest soil and lowest
                      for sandy soil. Comparatively, strontium displayed a lower
                      adsorption forall three soils, with a slightly higher
                      adsorption in silty soil and almost similar sorption for
                      both forest and sandysoils.We conclude that the applied
                      organic amendments with field application rates will not
                      deplete the FES(Frayed Edge Sites) responsible for cesium
                      sorption in mineral soils. Furthermore, with the present
                      applicationrates the increase in amount of organic matter is
                      not high enough to significantly affect the strontium
                      sorption inmineral soils. The desorption experiments showed
                      that about 1/3 of the adsorbed cesium was extractable in
                      siltysoil and almost half was extractable in forest and
                      sandy soils. In case of strontium, about half was
                      extractable inthe three soils. Similar to sorption, the
                      effect of amendments was negligible compared to the soil
                      type.},
      month         = {Apr},
      date          = {2014-04-27},
      organization  = {EGU General Assembly 2014, Wien
                       (Österreich), 27 Apr 2014 - 2 May
                       2014},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {245 - Chemicals in the Environment (POF2-245) / 255 -
                      Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF2-245 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)1 / PUB:(DE-HGF)16},
      url          = {https://juser.fz-juelich.de/record/172404},
}