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@ARTICLE{Liang:903178,
      author       = {Liang, Yan and Luo, Yonglu and Lu, Zhiwei and Klumpp, Erwin
                      and Shen, Chongyang and Bradford, Scott A.},
      title        = {{E}vidence on enhanced transport and release of silver
                      nanoparticles by colloids in soil due to modification of
                      grain surface morphology and co-transport},
      journal      = {Environmental pollution},
      volume       = {276},
      issn         = {0013-9327},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-04898},
      pages        = {116661 -},
      year         = {2021},
      abstract     = {Natural soils have frequently been considered to decrease
                      the mobility of engineered nanoparticles (NPs) in comparison
                      to quartz sand due to the presence of colloids that provide
                      additional retention sites. In contrast, this study
                      demonstrates that the transport and release of silver
                      nanoparticles (AgNPs) in sandy clay loam and loamy sand
                      soils were enhanced in the presence of soil colloids that
                      altered soil grain surface roughness. In particular, we
                      found that the retention of AgNPs in purified soils
                      (colloid-free and acid-treated) was more pronounced than in
                      raw (untreated) soils or soils treated to remove organic
                      matter (H2O2 or 600 °C treated). Chemical analysis and
                      scanning electron microscopy (SEM) with energy-dispersive
                      X-ray spectroscopy demonstrated that the grain surfaces of
                      raw and organic matter-removed soils were abundant with
                      metal oxides and colloids compared to purified soil. Column
                      transport and release experimental results, SEM images, and
                      interaction energy calculations revealed that a significant
                      amount of concave locations on purified soils hindered AgNP
                      release by diffusion or ionic strength (IS) reduction due to
                      deep primary energy minima. Conversely, AgNPs that were
                      retained in soils in the presence of soil colloids were more
                      susceptible to release under IS reduction because the
                      primary minimum was shallow on the tops of convex locations
                      created by attached soil colloids. Additionally, a
                      considerable fraction of retained AgNPs in raw soil was
                      released after cation exchange followed by IS reduction,
                      while no release occurred for purified soil under the same
                      conditions. The AgNP release was highly associated with soil
                      colloids and co-transport of AgNPs and soil colloids was
                      observed. Our work is the first to show that the presence of
                      soil colloids can inhibit deposition and facilitate the
                      release and co-transport of NPs in soil by alteration of the
                      soil grain surface morphology and shallow primary minimum
                      interactions.},
      cin          = {IBG-3},
      ddc          = {690},
      cid          = {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       = {33592438},
      UT           = {WOS:000630774100015},
      doi          = {10.1016/j.envpol.2021.116661},
      url          = {https://juser.fz-juelich.de/record/903178},
}