title: Bioaccumulation of Fe2O3(magnetic) nanoparticles in Ceriodaphnia dubia.
abstract: While nano-Fe(2)O(3)(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-Fe(2)O(3)(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-Fe(2)O(3)(m) in the gut, with the maximum accumulation being achieved after 6 h of exposure. The concentration of nano-Fe(2)O(3) 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-Fe(2)O(3)(m) bioaccumulation. In a clean environment without NPs, depuration of nano-Fe(2)O(3)(m) occurred, and food addition accelerated the depuration process.
authors.affiliation: Department of Civil, Architectural and Environmental Engineering, Missouri University of Science & Technology, Rolla, MO 65409, USA.
authors.forename: Ji
authors.initials: J
authors.lastname: Hu
authors.forename: Demin
authors.initials: D
authors.lastname: Wang
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Wang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Wang
mesh_terms: D000818:Animals; D001151:Arsenic / Q000633:toxicity; D033361:Cladocera / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D005290:Ferric Compounds / Q000032:analysis / Q000378:metabolism*; D053758:Nanoparticles / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D001151:Arsenic