Bioaccumulation of Fe₂O₃(magnetic) nanoparticles in Ceriodaphnia dubia
2012
Hu, Ji | Wang, Demin | Wang, Jiangtao | Wang, Jianmin
While nano-Fe₂O₃(magnetic) is generally considered non-toxic, it could serve as a carrier of other toxic chemicals such as As(V) and enhance their toxicity. The bioaccumulation of nano-Fe₂O₃(m) with different exposure times, NP concentrations, and pH conditions was investigated using Ceriodaphnia dubia (C. dubia) as the model organism. Under natural pH conditions, C. dubia significantly accumulated nano-Fe₂O₃(m) in the gut, with the maximum accumulation being achieved after 6 h of exposure. The concentration of nano-Fe₂O₃ also impacted its accumulation, with the maximum uptake occurring at 20 mg/L or more. In addition, the highest bioaccumulation occurred in a pH range of 7–8 where the highest feeding rate was reported, confirming that the ingestion of NPs is the main route of nano-Fe₂O₃(m) bioaccumulation. In a clean environment without NPs, depuration of nano-Fe₂O₃(m) occurred, and food addition accelerated the depuration process.
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