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Toxicity of various silver nanoparticles compared to silver ions in Daphnia magna.

Asghari S, Johari SA, Lee JH, Kim YS, Jeon YB, Choi HJ, Moon MC, Yu IJ - J Nanobiotechnology (2012)

Bottom Line: Also, the swimming behavior and visible uptake of the nanoparticles by Daphnia were investigated and compared.All the silver species in this study caused abnormal swimming by the D. magna.According to the present results, silver nanoparticles should be classified according to GHS (Globally Harmonized System of classification and labeling of chemicals) as "category acute 1" to Daphnia neonates, suggesting that the release of nanosilver into the environment should be carefully considered.

View Article: PubMed Central - HTML - PubMed

Affiliation: Young Researchers Club, Science and Research Branch, Islamic Azad University, Tehran, Iran.

ABSTRACT

Background: To better understand the potential ecotoxicological impacts of silver nanoparticles released into freshwater environments, the Daphnia magna 48-hour immobilization test was used.

Methods: The toxicities of silver nitrate, two types of colloidal silver nanoparticles, and a suspension of silver nanoparticles were assessed and compared using standard OECD guidelines. Also, the swimming behavior and visible uptake of the nanoparticles by Daphnia were investigated and compared. The particle suspension and colloids used in the toxicity tests were well-characterized.

Results: The results obtained from the exposure studies showed that the toxicity of all the silver species tested was dose and composition dependent. Plus, the silver nanoparticle powders subsequently suspended in the exposure water were much less toxic than the previously prepared silver nanoparticle colloids, whereas the colloidal silver nanoparticles and AgNO(3) were almost similar in terms of mortality. The silver nanoparticles were ingested by the Daphnia and accumulated under the carapace, on the external body surface, and connected to the appendages. All the silver species in this study caused abnormal swimming by the D. magna.

Conclusion: According to the present results, silver nanoparticles should be classified according to GHS (Globally Harmonized System of classification and labeling of chemicals) as "category acute 1" to Daphnia neonates, suggesting that the release of nanosilver into the environment should be carefully considered.

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EDX spectrometer patterns of nAg2 and nAg3; (Ni signals in EDX spectrometer are from TEM grid).
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Figure 4: EDX spectrometer patterns of nAg2 and nAg3; (Ni signals in EDX spectrometer are from TEM grid).

Mentions: As seen in Figure 4, the EDX analyses revealed the presence of elemental silver in the nAg2 colloid and nAg3 preparation.


Toxicity of various silver nanoparticles compared to silver ions in Daphnia magna.

Asghari S, Johari SA, Lee JH, Kim YS, Jeon YB, Choi HJ, Moon MC, Yu IJ - J Nanobiotechnology (2012)

EDX spectrometer patterns of nAg2 and nAg3; (Ni signals in EDX spectrometer are from TEM grid).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3344683&req=5

Figure 4: EDX spectrometer patterns of nAg2 and nAg3; (Ni signals in EDX spectrometer are from TEM grid).
Mentions: As seen in Figure 4, the EDX analyses revealed the presence of elemental silver in the nAg2 colloid and nAg3 preparation.

Bottom Line: Also, the swimming behavior and visible uptake of the nanoparticles by Daphnia were investigated and compared.All the silver species in this study caused abnormal swimming by the D. magna.According to the present results, silver nanoparticles should be classified according to GHS (Globally Harmonized System of classification and labeling of chemicals) as "category acute 1" to Daphnia neonates, suggesting that the release of nanosilver into the environment should be carefully considered.

View Article: PubMed Central - HTML - PubMed

Affiliation: Young Researchers Club, Science and Research Branch, Islamic Azad University, Tehran, Iran.

ABSTRACT

Background: To better understand the potential ecotoxicological impacts of silver nanoparticles released into freshwater environments, the Daphnia magna 48-hour immobilization test was used.

Methods: The toxicities of silver nitrate, two types of colloidal silver nanoparticles, and a suspension of silver nanoparticles were assessed and compared using standard OECD guidelines. Also, the swimming behavior and visible uptake of the nanoparticles by Daphnia were investigated and compared. The particle suspension and colloids used in the toxicity tests were well-characterized.

Results: The results obtained from the exposure studies showed that the toxicity of all the silver species tested was dose and composition dependent. Plus, the silver nanoparticle powders subsequently suspended in the exposure water were much less toxic than the previously prepared silver nanoparticle colloids, whereas the colloidal silver nanoparticles and AgNO(3) were almost similar in terms of mortality. The silver nanoparticles were ingested by the Daphnia and accumulated under the carapace, on the external body surface, and connected to the appendages. All the silver species in this study caused abnormal swimming by the D. magna.

Conclusion: According to the present results, silver nanoparticles should be classified according to GHS (Globally Harmonized System of classification and labeling of chemicals) as "category acute 1" to Daphnia neonates, suggesting that the release of nanosilver into the environment should be carefully considered.

Show MeSH
Related in: MedlinePlus