Toxic effects and bioaccumulation of nano-, micron- and ionic-Ag in the polychaete, Nereis diversicolor
There is increasing concern about the toxicities and potential risks, both still poorly understood, of silver nanoparticles for the aquatic environment after their eventual release via wastewater discharges. In this study, the toxicities of sediment associated nano (<100 nm)-, micron (2–3.5 μm)-...
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Published in | Aquatic toxicology Vol. 105; no. 3; pp. 403 - 411 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.10.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | There is increasing concern about the toxicities and potential risks, both still poorly understood, of silver nanoparticles for the aquatic environment after their eventual release via wastewater discharges. In this study, the toxicities of sediment associated nano (<100
nm)-, micron (2–3.5
μm)- and ionic (AgNO
3)-Ag on the sediment-dwelling polychaete,
Nereis diversicolor, were compared after 10 days of sediment exposure, using survival, DNA damage (comet assay) and bioaccumulation as endpoints. The nominal concentrations used in all exposure scenarios were 0, 1, 5, 10, 25, and 50
μg
Ag/g dry weight (dw) sediment. Our results showed that Ag was able to cause DNA damage in
Nereis coelomocytes, and that this effect was both concentration- and Ag form-related. There was significantly greater genotoxicity (higher tail moment and tail DNA intensities) at 25 and 50
μg/g
dw in nano- and micron-Ag treatments and at 50
μg/g
dw in the ionic-Ag treatment compared to the controls (0
μg/g
dw). The nano-Ag treatment had the greatest genotoxic effect of the three tested Ag forms, and the ionic-Ag treatment was the least genotoxic.
N. diversicolor did accumulate sediment-associated Ag from all three forms. Ag body burdens at the highest exposure concentration were 8.56
±
6.63, 6.92
±
5.86 and 9.86
±
4.94
μg/g
dw for worms in nano-, micron- and ionic-Ag treatments, respectively, but there was no significant difference in Ag bioaccumulation among the three treatments. |
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Bibliography: | http://dx.doi.org/10.1016/j.aquatox.2011.07.014 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0166-445X 1879-1514 |
DOI: | 10.1016/j.aquatox.2011.07.014 |