Journal
CHEMOSPHERE
Volume 143, Issue -, Pages 99-105Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.06.046
Keywords
Surface interaction; Negative charge; Mixture toxicity; Acute toxicity; Bioavailability; Divalent cation
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Funding
- National Research Foundation of Korea [2013R1A1A1007708]
- Research Project for Environmental Risk Assessment of Manufactured Nanomaterial - Korea Institute of Toxicology [KK-1402-02]
- Green Remediation Research Center for Organic-Inorganic Combined Contamination (The GAIA Project), Korea Ministry of Environment [2012000550001]
- National Research Foundation of Korea [2013R1A1A1007708] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Citrate-coated AgNPs (c-AgNPs) have negatively charged surfaces and their surface interactions with heavy metals can affect metal toxicity in aquatic environments. This study used Daphnia magna to compare the acute toxicities and bioaccumulation of As(V), Cd, and Cu when they interact with c-AgNPs. The 24-h acute toxicities of As(V) and Cu were not affected by the addition of c-AgNPs, while bioaccumulation significantly decreased in the presence of c-AgNPs. In contrast, both the 24-h acute toxicity and bioaccumulation of Cd increased in the presence of c-AgNPs. These toxicity and bioaccumulation trends can be attributed to the interactions between the AgNP surface and the heavy metals. As(V) and c-AgNPs compete by negative charge, decreasing As(V) toxicity. Copper adheres readily to c-AgNP citrate, decreasing Cu bioavailability, and thus reducing Cu toxicity and bioaccumulation. Citrate complexes with divalent cations such as Ca and Mg reduce the competition between divalent cations and Cd on biotic ligand, increasing toxicity and bioaccumulation of Cd. This study shows that surface properties determine the effect of c-AgNPs on heavy metal toxicities and bioaccumulations; hence, further studies on the effect of nanoparticle by it surface properties are warranted. (C) 2015 Elsevier Ltd. All rights reserved.
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