Chronic toxicity of double-walled carbon nanotubes to three marine organisms: Influence of different dispersion methods

Kevin Wh KWOK, Kenneth MY LEUNG, Emmanuel FLAHAUT, Jinping CHENG, Shuk Han Cheng

Research output: Contribution to journalArticlespeer-review

48 Citations (Scopus)

Abstract

Aim: Double-walled carbon nanotubes (DWNTs) are found in a variety of consumer products, but there are no ecotoxicity data of DWNTs into marine organisms. Materials & methods: Chronic toxicity of DWNTs was investigated with the diatom Thalassiosira pseudonana, copepod Tigriopus japonicus and medaka Oryzias melastigma. DWNTs were dispersed using sonication (so-DWNTs) and stirring (st-DWNTs) for comparison. Results: The median aggregation size (0.89 µm²) of so-DWNTs was smaller than that of st-DWNTs (21.8 µm²). Exposure to DWNTs led to growth inhibition of T. pseudonana with EC₅₀s of 1.86 and 22.7 mg/l for so- and st-DWNTs, respectively. Population growth of T. japonicus was reduced to 0.1 mg/l for so-DWNTs and 10 mg/l for st-DWNTs. Growth inhibition in O. melastigma was observed at 10 mg/l for so-DWNTs but not for st-DWNTs. Conclusion: Given that so-DWNTs are consistently significantly more toxic than st-DWNTs, dispersion method and size of aggregations should be considered in DWNT toxicity testing. Copyright © 2010 Future Medicine Ltd
Original languageEnglish
Pages (from-to)951-961
JournalNanomedicine
Volume5
Issue number6
Early online date24 Aug 2010
DOIs
Publication statusPublished - Aug 2010

Citation

Kwok, K. W. H., Leung, K. M. Y., Flahaut, E., Cheng, J., & Cheng, S. H. (2010). Chronic toxicity of double-walled carbon nanotubes to three marine organisms: Influence of different dispersion methods. Nanomedicine, 5(6), 951-961. doi: 10.2217/nnm.10.59

Keywords

  • Ecotoxicity
  • Growth inhibition
  • Marine environment
  • Nanomaterials
  • Population effect

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