Accumulation and toxicity of metal oxide nanoparticles in a soft-sediment estuarine amphipod.

摘要: Estuarine and marine sediments are a probable end point for many engineered nanoparticles (ENPs) due to enhanced aggregation sedimentation in waters, as well uptake deposition by suspension-feeding organisms on the seafloor. Benthic infaunal living encounter relatively high concentrations of pollutants may also suffer toxic effects ENPs. We tested whether three heavily used metal oxide ENPs, zinc (ZnO), copper (CuO), nickel (NiO) were an estuarine amphipod, Leptocheirus plumulosus. results from 10-day laboratory bioassays estimate potential demographic impacts ENP exposure. evaluated fate transport pathways ENPs experiments elucidate routes Dissolved Zn was found sediment pore water overlying samples at 10 fold Cu or Ni, pattern indicative dissolution rate ZnO compared with CuO NiO Accumulation metals amphipod tissues increased exposure all suggesting possible higher taxa. Amphipods accumulated ≤600 μg g(-1) 1000 Ni g(-1). Amphipod mortality concentrations, but showed no significant increase 2000 The median lethal concentration (LC50) 763 868 Our indicate that not L. plumulosus toxicity primarily ion while is nanoparticle