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The shape and speciation of Ag nanoparticles drive their impacts on organisms in a lotic ecosystem

Abstract : Silver nanomaterials with different shapes (spheres, plates, wires, rods, cubes) are valued by industries and scientists for their shape-dependent properties which make them useful for diverse applications. In a saferby-design perspective, controlling the shape of Ag nanomaterials could be an option to increase their properties while lowering either their hazard or their exposure potentials. Nine indoor aquatic mesocosms reproducing a lotic ecosystem were contaminated with chronic low-level additions of Ag nanospheres (Sp-Ag) and nanoplates (Pl-Ag) for a month. A shape-dependent impact under such environmentally relevant exposure conditions was observed. Pl-Ag induced a moderate oxidative stress in adult Gammarus fossarum (after molting) and a hormesis effect on planktonic microbial communities, while Sp-Ag had no effect. In an environmental risk perspective, our results highlight which ecological niches of a lotic ecosystem would be more impacted by Pl-Ag: (i) >72% of the total Ag was found fully sulfidized in surficial sediment and had only a moderate impact on benthic macro-organisms, (ii) only 11% to 15% of the Ag remained in the water column after 1 month, but Ag was under a more reactive speciation that impacts the planktonic community.
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Contributor : Catherine Santaella Connect in order to contact the contributor
Submitted on : Monday, August 23, 2021 - 11:06:25 AM
Last modification on : Wednesday, October 20, 2021 - 12:09:03 AM
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Melanie Auffan, Catherine Santaella, L Brousset, M Tella, E Morel, et al.. The shape and speciation of Ag nanoparticles drive their impacts on organisms in a lotic ecosystem. Environmental science‎.Nano, Royal Society of Chemistry, 2020, 7, pp.3167 - 3177. ⟨10.1039/d0en00442a⟩. ⟨hal-03065323⟩



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