Effects of silver and cerium dioxide micro- and nano-sized particles on Daphnia magna
| العنوان: | Effects of silver and cerium dioxide micro- and nano-sized particles on Daphnia magna |
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| المؤلفون: | Anamika Biswas, Mark A. Jepson, Philipp Rosenkranz, Jamie R. Lead, Birgit K Gaiser, Charles R. Tyler, Teresa F. Fernandes, Vicki Stone |
| المصدر: | Journal of Environmental Monitoring. 13:1227 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Silver, Daphnia magna, chemistry.chemical_element, Motor Activity, Management, Monitoring, Policy and Law, Daphnia, Toxicology, Animals, Carapace, Particle Size, Swimming, Dose-Response Relationship, Drug, biology, Public Health, Environmental and Occupational Health, Cerium, Feeding Behavior, General Medicine, biology.organism_classification, Dose–response relationship, chemistry, Toxicity, Nanoparticles, Particle size, Moulting, Water Pollutants, Chemical, Nuclear chemistry |
| الوصف: | Acute (96 h) and chronic (21 d) exposures of Daphnia magna neonates were carried out with nano- and micro-sized Ag and CeO(2) particles to assess the influence of both material and size of particles on mortality and moulting. Mortality rates for silver in the acute exposures were: AgNP, 56.7 ± 23.3% at 0.1 mg L(-1) and 100 ± 20% at 1 mg L(-1), and micro-Ag, 13.3 ± 6.7% at 0.1 mg L(-1) and 80 ± 20% at 1 mg L(-1). CeO(2) was not acutely toxic at concentrations up to 10 mg L(-1). Mortality for Ag over 21d at concentrations of up to 0.05 mg L(-1) was low, while mortality of 30% was observed for 0.001 mg L(-1) of nano-Ag. CeO(2), with the exception of the 10 mg L(-1) of nano-CeO(2) (100% mortality by day 7), was non-toxic. Inhibition of moulting and growth in the acute study occurred at toxic concentrations (Ag particles), and at 10 mg L(-1) of nano-CeO(2). The chronic study revealed reduced moulting at 0.001 mg L(-1) of nano-Ag and 0.01 and 0.05 mg L(-1) of both sizes of Ag, but there was no impact on D. magna size, and no effects of CeO(2). The toxicity of nano-CeO(2) may be attributed to reduced feeding and physical interference with the daphnids' carapace, resulting in reduced swimming ability. Our results suggest that Ag NPs in particular have the potential to be harmful to aquatic invertebrates after release into the environment, whereas CeO(2) particles appear to cause little adverse effects, and only at environmentally irrelevant concentrations. |
| تدمد: | 1464-0333 1464-0325 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4dd0c4c71c485be6a580a62c5211c532 https://doi.org/10.1039/c1em10060b |
| رقم الأكسشن: | edsair.doi.dedup.....4dd0c4c71c485be6a580a62c5211c532 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14640333 14640325 |
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