Toxicity of Lead on Ceriodaphnia Dubia in the Presence of Nano-CeO2 and Nano-TiO2

Abstract

Although engineered nanoparticles (NPs) could negatively impact environmental organisms, the synergistic effect of NPs and other toxic substances, which could be more significant than that of NP alone, have seldom been examined. the effect of two common NPs, nano-CeO2 and nano-TiO2, on the toxicity of Pb was evaluated using Ceriodaphnia dubia (C. dubia) as the model organism. Standard EPA procedures were followed in the toxicity evaluation. the toxicity of bare NPs (without Pb) was first evaluated and safe doses (levels without causing lethal effect) of NPs were used in the synergistic studies. It was found that the overall toxicity of Pb in the system containing NPs was greater than that of Pb alone, as indicted by the reduced median lethal concentration (LC50) of soluble Pb. the sorption of Pb onto the NP, and the uptake of NPs in the gastrointestinal tract of C. dubia were validated. Therefore, the uptake of Pb-loaded NPs increased the exposure of C. dubia to Pb, resulting in the enhanced toxicity. Reducing the solution pH could shift Pb speciation and enhance the overall toxicity of Pb, with or without the presence of NPs. © 2012 Elsevier Ltd.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

China Scholarship Council, Grant None

Keywords and Phrases

Ceriodaphnia dubia; Pb; Synergistic effect; Toxicity

International Standard Serial Number (ISSN)

1879-1298; 0045-6535

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Jan 2012

PubMed ID

22682362

Link to Full Text

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