Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 92, Issue -, Pages 57-63Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2013.02.004
Keywords
Silver nanoparticles; Silver ions; Embryonic toxicity; Humic acids
Categories
Funding
- Nano R&D program through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [2009-0082745]
- Innovative Technology of Ecological Restoration project at GIST
- National Research Foundation of Korea [2009-0082745] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The final destination point of nanoparticles is the environment, where they remain a long period; therefore, a deep understanding of the relationship between nanoparticles and the environmental factors is required. Japanese medaka embryos were exposed to two differently prepared AgNPs: freshly prepared AgNPs and aged AgNPs. With these two AgNP preparations, we studied the impacts of humic acid in terms of embryonic toxicity, as well as the behavior of AgNPs. Aged AgNPs exhibited a lower lethal concentration (LC50) value (1.44 mg/L) compared to fresh AgNPs (3.53 mg/L) through 96 h acute toxicity tests, due to the release of silver ions, as confirmed by kinetic analysis. The presence of humic acids considerably reduced the toxicity of aged AgNPs due to complexation with silver ions. Agglomeration, induced by interactions with humic acid, might reduce the bioavailability of AgNPs to Japanese medaka embryos. This study demonstrates that aged AgNPs releasing more silver ions are more toxic than fresh AgNPs, and humic acids play a role in reducing the toxicity of aged AgNPs. (c) 2013 Elsevier Inc. All rights reserved.
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