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  • 标题:Ecological Uptake and Depuration of Carbon Nanotubes by Lumbriculus variegatus
  • 作者:Elijah J. Petersen ; Qingguo Huang ; Walter J. Weber, Jr.
  • 期刊名称:Environmental Health Perspectives
  • 印刷版ISSN:0091-6765
  • 电子版ISSN:1552-9924
  • 出版年度:2008
  • 卷号:116
  • 期号:4
  • 页码:496-500
  • DOI:10.1289/ehp.10883
  • 语种:English
  • 出版社:OCR Subscription Services Inc
  • 摘要:Background Carbon nanotubes represent a class of nanomaterials having broad application potentials and documented cellular uptake and ecotoxicological effects that raise the possibility that they may bioaccumulate in living organisms. Objectives Radioactively labeled nanotubes were synthesized using a novel methane chemical vapor deposition procedure. Single-walled carbon nanotubes (SWNTs), multiwalled carbon nanotubes (MWNTs), and pyrene were spiked to sediment samples, and the respective uptake and depuration of these nanotubes and pyrene were assessed by the oligochaete, Lumbriculus variegatus . Results 14C-labeled carbon nanotubes were developed for these experiments to overcome significant previous limitations for quantifying nanotube materials in environmental and biological media. Biota-sediment accumulation factors for SWNTs and MWNTs were observed to be almost an order of magnitude lower than those for pyrene, a four-ringed polycyclic aromatic hydrocarbon (PAH). The depuration behaviors of the oligochaete suggested that the nanotubes detected in these organisms were associated with sediments remaining in the organism guts and not absorbed into cellular tissues as was the pyrene. The results suggest that, unlike PAHs, purified carbon nanotubes do not readily absorb into organism tissues.
  • 关键词:bioaccumulation; carbon nanotubes; ecotoxicology; environmental risks; fullerenes; Lumbriculus variegatus ; MWNT; nanomaterials; nanotechnology; SWNT
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