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Dissolution and transformation of cerium oxide nanoparticles in plant growth media

Schwabe, Franziska ; Schulin, Rainer ; Rupper, Patrick ; Rotzetter, Aline ; Stark, Wendelin ; Nowack, Bernd

In: Journal of Nanoparticle Research, 2014, vol. 16, no. 10, p. 1-11

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    Titre
    • Dissolution and transformation of cerium oxide nanoparticles in plant growth media
    Auteur
    • Schwabe, Franziska. Soil Protection, Institute of Terrestrial Ecosystems, ETH-Zurich, Universitaetstrasse 16, 8092, Zurich, Switzerland
    • Schulin, Rainer. Soil Protection, Institute of Terrestrial Ecosystems, ETH-Zurich, Universitaetstrasse 16, 8092, Zurich, Switzerland
    • Rupper, Patrick. Laboratory of Advanced Fibers, Empa-Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014, St. Gallen, Switzerland
    • Rotzetter, Aline. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, 8093, Zurich, Switzerland
    • Stark, Wendelin. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, 8093, Zurich, Switzerland
    • Nowack, Bernd. Technology & Society Laboratory, Empa-Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014, St. Gallen, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Nanoparticle Research, 2014, vol. 16, no. 10, p. 1-11. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325895
    Summary
    From environmental modeling of engineered nanomaterial (ENM) release, it is clear that ENMs will enter soils, where they interact with soil compounds as well as plant roots. We analyzed three different size groups of cerium dioxide nanoparticles (CeO2-NPs) in respect to chemical changes in the most common plant growth medium, Hoagland solution. We created a simple environmental model using liquid dispersions of 9-, 23-, and 64-nm-uncoated CeO2-NPs. We found that CeO2-NPs release dissolved Ce when the pH of the medium is below 4.6 and in the presence of strong chelating agents even at pH of 8. In addition, we found that in reaction with Fe2+-ions, equimolar amounts of Ce were released from NPs. We could elucidate the involvement of the CeO2-NPs surface redox cycle between Ce3+ and Ce4+ to explain particle transformation. The chemical transformation of CeO2-NPs was summarized in four probable reactions: dissolution, surface reduction, complexation, and precipitation on the NP surface. The results show that CeO2-NPs are clearly not insoluble as often stated but can release significant amounts of Ce depending on the composition of the surrounding medium.