|Title (Primary)||Distribution of engineered Ag nanoparticles in the aquatic-terrestrial transition zone: a long-term indoor floodplain mesocosm study|
|Author||Metreveli, G.; Kurtz, S.; Rosenfeldt, R.R.; Seitz, F.; Kumahor, S.K.; Grün, A.; Klitzke, S.; Vogel, H.-J.; Bundschuh, M.; Baumann, T.; Schulz, R.; Manz, W.; Lang, F.; Schaumann, G.E.|
|Topic||T5 Future Landscapes|
The fate of engineered nanoparticles in the aquatic-terrestrial transition zone is decisive for their effect in the environment. However, our knowledge on processes within this interface is rather low. Therefore, we used a floodplain stream mesocosm to enhance our understanding of the long-term distribution and biological effects of citrate-coated silver nanoparticles (Ag-NPs) in this ecosystem. Parallel to pulsed dosing of Ag-NPs, we observed fluctuating but successively increasing concentrations of aqueous Ag, 88–97% of which was categorized as particles. The remaining dissolved fraction was mainly complexed with natural organic matter (NOM). The major Ag fraction (50%) was associated with the uppermost sediment layer. The feeding activity of benthic amphipods was largely unaffected, which could be explained by the low Ag concentration and complexation of released Ag+ with NOM. According to our hypothesis, only a small nanoparticle fraction (6%) moved to the terrestrial area due to aquatic aging and enrichment of Ag-NPs in sediments and biota. Nanoparticle infiltration in deeper sediment and soil layers was also limited. We expect that a small fraction of nanoparticles remaining in the water for several weeks can be transported over large distances in rivers. The Ag-NPs accumulated in the top layer of sediment and soil may serve as a source of toxic Ag+ ions or may be remobilized due to changing physico-chemical conditions. Furthermore, the high enrichment of Ag-NPs on algae (up to 250 000-fold) and leaves (up to 11 000-fold) bears risk for organisms feeding on those resources and for the transfer of Ag within the food web.
|Persistent UFZ Identifier||https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24708|
|Metreveli, G., Kurtz, S., Rosenfeldt, R.R., Seitz, F., Kumahor, S.K., Grün, A., Klitzke, S., Vogel, H.-J., Bundschuh, M., Baumann, T., Schulz, R., Manz, W., Lang, F., Schaumann, G.E. (2021):
Distribution of engineered Ag nanoparticles in the aquatic-terrestrial transition zone: a long-term indoor floodplain mesocosm study
Environ. Sci.-Nano 8 (6), 1771 - 1785