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

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.

Bibliographic Details

Main Authors:	Auffan, Mélanie, Santaella, Catherine, Brousset, L., Tella, Marie, Morel, E., Ortet, Philippe, Barakat, Mohamed, Chaneac, C., Issartel, J., Angeletti, Bernard, Levard, Clément, Hazemann, Jean-Louis, Wiesner, M., Rose, Jérôme, Thiery, Alain, Bottero, Jean Yves
Format:	article biblioteca
Language:	eng
Subjects:	M40 - Écologie aquatique, P02 - Pollution, nanomatériau, argent, plancton, impact sur l'environnement, bioaccumulation, milieu lotique, stress oxydatif, http://aims.fao.org/aos/agrovoc/c_74f4c8aa, http://aims.fao.org/aos/agrovoc/c_7068, http://aims.fao.org/aos/agrovoc/c_5950, http://aims.fao.org/aos/agrovoc/c_24420, http://aims.fao.org/aos/agrovoc/c_32389, http://aims.fao.org/aos/agrovoc/c_12248, http://aims.fao.org/aos/agrovoc/c_37481,
Online Access:	http://agritrop.cirad.fr/598293/ http://agritrop.cirad.fr/598293/7/598293-ed.pdf
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