John Wiley & Sons, Ltd.

Interaction of functionalized fullerenes and metal accumulation in Daphnia magna

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In aquatic environments, transformation of pollutants by associating with functionalized carbon‐based nanoparticles can dramatically change their cycling pathways. The present study quantified the uptake and depuration behavior of cadmium (Cd) and zinc (Zn) bound with functionalized fullerene nanoparticles (f‐nC60) in a freshwater cladoceran Daphnia magna in the well dispersed medium. Metal uptake proceeded with a linear pattern during the 8‐h exposure period, and the uptake rate constants (ku) were 1.3–1.4 folds higher for Cd or comparable for Zn bound with f‐nC60 than those of the free ones. The assimilation efficiencies (AEs) of Cd and Zn bound with f‐nC60 were significantly enhanced when compared to those metals bound with algal food. Furthermore, the depuration of metals bound with f‐nC60 was relatively slower compared to the depuration of metals bound with carbon nanotubes. A longer exposure to f‐nC60 resulted in an even slower depuration of metals. We concluded that metal binding with f‐nC60 as modified nanoparticles could serve as a new pathway for the elevated metal accumulation in Daphnia. Environ Toxicol Chem © 2014 SETAC

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