Title
The chronic toxicity of CuO nanoparticles and copper salt to **Daphnia magna**The chronic toxicity of CuO nanoparticles and copper salt to **Daphnia magna**
Author
Faculty/Department
Faculty of Sciences. Biology
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences. Veterinary Sciences
Research group
Systemic Physiological and Ecotoxicological Research (SPHERE)
Veterinary physiology and biochemistry
Publication type
article
Publication
Amsterdam,
Subject
Chemistry
Biology
Source (journal)
Journal of hazardous materials. - Amsterdam
Volume/pages
283(2015), p. 416-422
ISSN
0304-3894
ISI
000347494200047
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In this study, the effects of CuO nanoparticles and CuCl2.2H2O were tested on Daphnia magna under chronic exposure scenarios. During a 21 day exposure to the nanoparticles and salt, the reproduction was followed by a daily count of the number of offspring. After the exposure, the adult Daphnia length and uptake of copper was measured. The dissolved, nanoparticle and aggregated fractions were distinguished in the exposure medium. The results showed that only a small fraction of the nanoparticles dissolved, while the majority of the particles formed large aggregates (> 450 nm). The dissolved fraction of the nanoparticles corresponded with the dissolved fraction of the copper salt. The effects of the nanoparticles (reproduction EC10: 0.546 mg Cu/l, EC20: 0.693 mg Cu/l, EC50: 1.041 mg Cu/l) on reproduction and length were much lower than the effects of the copper salts (reproduction EC10: 0.017 mg Cu/l, EC20: 0.019 mg Cu/l, EC50: 0.022 mg Cu/l). Based upon total body analysis, the Daphnia copper concentration appeared much higher when exposed to the nanoparticles than when exposed to the salt. These combined results indicate that the toxicity of CuO nanoparticles to D. magna is caused by copper ions formed during dissolution of the nanoparticles in the exposure medium.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/bf6ba5/72cb42eb.pdf
E-info
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