Toxicity and bioaccumulation of TiO2 nanoparticle aggregates in Daphnia magna

Xiaoshan Zhu, Yung Chang, Yongsheng Chen

Research output: Contribution to journalArticlepeer-review

453 Scopus citations


Little is known about the potential ecotoxicity of engineered nanoparticles (NPs) to aquatic organisms. To carefully address this issue, we conducted a comprehensive toxicity assessment, including modified acute (72 h) and chronic (21 d) toxicity tests as well as nTiO2 accumulation analysis using Daphnia magna as a model organism. We found that nTiO2 exerted minimal toxicity to daphnia within the traditional 48 h exposure time, but caused high toxicity when the exposure time was extended to 72 h. This demonstrated that exposure duration may be a contributing factor in NP-mediated toxicity. Moreover, upon chronic exposure to nTiO2 for 21 d, daphnia displayed severe growth retardation and mortality, as well as reproductive defects. Interestingly, a significant amount of nTiO2 was found accumulated in daphnia. However, these daphnia displayed difficulty in eliminating nTiO2 from their body, presenting increased bioconcentration factor (BCF) values. This high level of bioaccumulation may interfere with food intake and ultimately affect growth and reproduction. In summary, long-term exposure of aquatic organisms to nTiO2 may alter the growing status of these organisms at both individual and population levels, posing risks to aquatic ecosystems.

Original languageEnglish (US)
Pages (from-to)209-215
Number of pages7
Issue number3
StatePublished - Jan 2010


  • Bioaccumulation
  • Daphnia magna
  • TiO nanoparticle
  • Toxicity

ASJC Scopus subject areas

  • General Chemistry
  • Public Health, Environmental and Occupational Health
  • Pollution
  • Health, Toxicology and Mutagenesis
  • Environmental Engineering
  • Environmental Chemistry


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