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Prise en compte de l’évolution de l’état d’agglomération dans l’étude de l’écotoxicité des nanoparticules

Abstract : When assessing the hazardous properties of nanomaterials for the environment, there are numerous significant research challenges. Among them, it appears necessary to study the effect of nanomaterials and nanoparticles throughout their life cycle including both initial forms and physico-chemically modified forms (i. e. aggregated or agglomerated forms) that may result from an ageing process. We addressed this question by focusing on the effect of commercial ceria nanoparticle (nCeO2) suspensions on freshwater micro-algae. We assessed the effect of nCeO2 suspensions with different agglomeration/aggregation states obtained by using an artificial ageing process. It was shown that the algae growth inhibition was similar after exposure to non-degraded or degraded nCeO2 suspensions. Those results support the fact that aggregation or agglomeration has little influence when focusing on the growth of algal cells. Moreover by comparison to our previous studies performed with other ceria particle suspensions, it was shown that the primary particle size and consequently the particle surface area is a relevant parameter in assessing the ecotoxicity of nanoparticles.
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https://hal-ineris.archives-ouvertes.fr/ineris-01869492
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  • HAL Id : ineris-01869492, version 1

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Nicolas Manier. Prise en compte de l’évolution de l’état d’agglomération dans l’étude de l’écotoxicité des nanoparticules. Rapport Scientifique INERIS, 2014, 2013-2014, pp.16-17. ⟨ineris-01869492⟩

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