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

Published

Journal Article

© The Royal Society of Chemistry. 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 safer-by-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.

Full Text

Duke Authors

Cited Authors

  • Auffan, M; Santaella, C; Brousset, L; Tella, M; Morel, E; Ortet, P; Barakat, M; Chaneac, C; Issartel, J; Angeletti, B; Levard, C; Hazemann, JL; Wiesner, M; Rose, J; Thiéry, A; Bottero, JY

Published Date

  • October 1, 2020

Published In

Volume / Issue

  • 7 / 10

Start / End Page

  • 3167 - 3177

Electronic International Standard Serial Number (EISSN)

  • 2051-8161

International Standard Serial Number (ISSN)

  • 2051-8153

Digital Object Identifier (DOI)

  • 10.1039/d0en00442a

Citation Source

  • Scopus