Toxicity and Accumulation of Cu and ZnO Nanoparticles in Daphnia magna

There is increasing recognition that the wide use of nanoparticles, such as Cu and ZnO nanoparticles, may pose risks to the environment

Yinlong Xiao; Martina G. Vijver; Guangchao Chen; Willie J. G. M. Peijnenburg

2015

Key concepts

Scholarcy highlights

  • There is increasing recognition that the wide use of nanoparticles, such as Cu and ZnO nanoparticles, may pose risks to the environment
  • The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online
  • It was found that at the LC50 level of Daphnia magna exposed to the nanoparticle suspensions, the relative contributions of ions released from CuNPs and ZnONPs to toxicity were around 26% and 31%, respectively, indicating that particles rather than the dissolved ions were the major source of toxicity
  • It was found that at the low exposure concentrations of CuNPs and ZnONPs the dissolved ions were predominantly accumulated, whereas at the high exposure concentrations, particles rather than the released ions played a dominant role in the accumulation process
  • Our results suggest that consideration on the contribution of dissolved ions to nanoparticle toxicity needs to be interpreted with care
  • Comparison of the ion concentration in the supernatants prepared by regular centrifugation employed in the present study and ultracentrifugation and comparison the particle profiles of the STM and of the supernatants of CuNPs and ZnONPs
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