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      Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake

      Saeed, Huma; Hartland, Adam; Lehto, N.J.; Baalousha, M.; Sikder, M.; Sandwell, Dean R.; Mucalo, Michael R.; Hamilton, David P.
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      Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake.pdf
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      DOI
       10.1038/s41598-018-36103-x
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      Saeed, H., Hartland, A., Lehto, N. J., Baalousha, M., Sikder, M., Sandwell, D. R., … Hamilton, D. P. (2018). Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake. Scientific Reports, 8. https://doi.org/10.1038/s41598-018-36103-x
      Permanent Research Commons link: https://hdl.handle.net/10289/12743
      Abstract
      Dissolved reactive phosphorous (DRP) in lake systems is conventionally considered to predominate over other dissolved P species, however, this view neglects an important set of interactions that occurs between P and reactive iron hydroxide surfaces. This study addresses the coupling of P with dispersed iron nanoparticles in lakes, an interaction that may fundamentally alter the bioavailability of P to phytoplankton. We used difusive gradients in thin flms (DGT) and ultrafltration to study Fe-P coupling in the water column of a monomictic lake over a hydrological year. Fe and P were predominantly colloidal (particle diameters>~5nm<~20nm) in both oxic epilimnetic and anaerobic hypolimnetic waters, but they were both DGT-labile under sub-oxic conditions, consistent with difusion and dissolution of Fe-and-P-bearing colloids within the DGT difusive gel. During peak stratifcation, increases in Fe and P bioavailability were spatially and temporally coincident with Fe nanoparticle dissolution and the formation of a deep chlorophyll maximum at 5–8m depth. These results provide a window into the coupling and decoupling of P with mobile iron colloids, with implications for our understanding of the behaviour of nutrients and their infuence on phytoplankton community dynamics.
      Date
      2018
      Type
      Journal Article
      Publisher
      Nature Publishing Group
      Rights
      This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
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