Nanoparticules : influence des conditions d’essais et des paramètres physico-chimiques sur l’écotoxicité pour le milieu aquatique

Abstract : Nanoparticles (NP) have been extensively applied in commercial products. It is consequently unavoidable that a large amount of NP will be discharged into environment, underlining the need to evaluate the ecotoxicological effect of NP towards aquatic organisms. However, relevant experts identified that “a large number of standardized test guidelines […] are unlikely to be applicable in their present state to engineered nanomaterials” (OECD). Indeed, the potential hazard of NP may be related to unusual physicochemical properties such as their particles size, agglomerate state in suspension and/or surface chemistry. Moreover, the method performed to disperse NP and achieve the testing suspensions can be seen as a drawback since it introduces an additional variable into the test design. Our work aims at characterizing the ecotoxicity of ceria NP toward aquatics micro-algae taking into account the influence of the dispersive methods and the physico-chemical properties of NP. The results obtained clearly show that ceria NP are ecotoxic toward micro algae compare to bulk materials. The toxic effect was principally attributing to the initial particles size and, to a lesser extent, to the agglomeration state. This suggest that exposure to NP could be expressed in surface area complementary to a mass basis. In addition, we have demonstrated that ceria NP were able to entrap and wrap the algae cells, which may contribute to the nanotoxicity.
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Nicolas Manier, Pascal Pandard. Nanoparticules : influence des conditions d’essais et des paramètres physico-chimiques sur l’écotoxicité pour le milieu aquatique. Rapport Scientifique INERIS, 2011, 2010-2011, pp.49-52. ⟨ineris-01869388⟩

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