Environmental exposure of a simulated pond ecosystem to a CuO nanoparticle-based wood stain throughout its life cycle
Résumé
Indoor aquatic mesocosms were used to assess the behavior of fragmented products of a wood stain containing CuO nanoparticles in a simulated pond ecosystem for 1 month. By-products of degradation containing Cu are likely to be released during the use and end-of-life of this wood stain. Cu (bio)transfor-mation and (bio)distribution within different environmental compartments (e.g. water, sediments, and ben-thic grazers) were carefully analyzed. Because of the presence of the stain matrix, CuO nanoparticles contained in fragmented products were less bio-physical-chemically transformed (dissolution, complexa-tion) with respect to pristine nanoparticles. After 28 days, only 1% of the Cu injected following fragmented product exposure remained in the water column (0.08 μg L −1), and 10% for the pristine CuO nanoparticles (2.67 μg L −1). Among these ∼10%, ∼51% were dissolved Cu species (1.35 μg L −1). These results are discussed with respect to the ecological compartments in which they accumulated, and to the doses to which aquatic organisms with distinct life traits were exposed.
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