Journal ArticleDOI
Effects of silver and cerium dioxide micro- and nano-sized particles on Daphnia magna.
Birgit K Gaiser,Anamika Biswas,Philipp Rosenkranz,Mark A. Jepson,Jamie R. Lead,Vicki Stone,Charles R. Tyler,Teresa F. Fernandes +7 more
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TLDR
It is suggested 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.Abstract:
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.read more
Citations
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Silver as Antibacterial Agent: Ion, Nanoparticle, and Metal
TL;DR: It can be concluded that the therapeutic window for silver is narrower than often assumed, however, the risks for humans and the environment are probably limited.
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Silver nanoparticles: a brief review of cytotoxicity and genotoxicity of chemically and biogenically synthesized nanoparticles
TL;DR: This present work concludes that biogenic silver nanoparticles are generally less cyto/genotoxic in vivo compared with chemically synthesized nanoparticles, and human cells were found to have a greater resistance to the toxic effects ofsilver nanoparticles in comparison with other organisms.
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Innovations in nanotechnology for water treatment.
TL;DR: An overview of recent advances in nanotechnologies for water and wastewater treatment processes is provided, including nanobased materials, such as nanoadsorbents, nanometals, nanomembranes, and photocatalysts.
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Effect of silver nanoparticles in crop plants Phaseolus radiatus and Sorghum bicolor: Media effect on phytotoxicity
TL;DR: Evidence of nanoparticle uptake by plants using electron microscopic studies is found and the properties of nanoparticles have been shown to change in soil, so this phenomenon has been attributed to the reduced toxicity of AgNPs to plants in soil medium.
Journal ArticleDOI
Toxicity of various silver nanoparticles compared to silver ions in Daphnia magna
Saba Asghari,Saba Asghari,Seyed Ali Johari,Seyed Ali Johari,Ji Hyun Lee,Yong Seok Kim,Yong Bae Jeon,Hyun Jung Choi,Min Chaul Moon,Il Je Yu +9 more
TL;DR: Silver nanoparticles should be classified according to GHS as "category acute 1" to Daphnia neonates, suggesting that the release of nanosilver into the environment should be carefully considered.
References
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Journal ArticleDOI
Nanoparticle Silver Released into Water from Commercially Available Sock Fabrics
Troy M. Benn,Paul Westerhoff +1 more
TL;DR: Variable leaching rates among sock types suggests that the sock manufacturing process may control the release of silver, and physical separation and ion selective electrode (ISE) analyses suggest that both colloidal and ionic silver leach from the socks.
Journal ArticleDOI
Toxicity of silver nanoparticles to Chlamydomonas reinhardtii.
Enrique Navarro,Flavio Piccapietra,Bettina Wagner,Fabio Marconi,Ralf Kaegi,Niksa Odzak,Laura Sigg,Renata Behra +7 more
TL;DR: The results indicate that the interaction of these particles with algae influences the toxicity of AgNP, which is mediated by Ag+.
Journal ArticleDOI
Nanosilver as a new generation of nanoproduct in biomedical applications
TL;DR: It has recently been demonstrated that NS has useful anti-inflammatory effects and improves wound healing, which could be exploited in developing better dressings for wounds and burns.
Journal ArticleDOI
Estimation of Cumulative Aquatic Exposure and Risk Due to Silver: Contribution of Nano-Functionalized Plastics and Textiles
TL;DR: It is indicated that PEC/PNEC ratios greater than 1 cannot be ruled out for freshwater ecosystems, in particular sediments, and no risk is predicted for microbial communities in sewage treatment plants.
Journal ArticleDOI
Effects of particle composition and species on toxicity of metallic nanomaterials in aquatic organisms.
TL;DR: The results indicate that nanosilver and nanocopper causeoxicity in all organisms tested, with 48-h median lethal concentrations as low as 40 and 60 microg/L, respectively, in Daphnia pulex adults, whereas titanium dioxide did not cause toxicity in any of the tests.