John Wiley & Sons, Ltd.

Impact of Carbon Nanotubes on the Toxicity of Inorganic Arsenic [As(III) and As(V)] to Daphnia magna: The Role of the Certain Arsenic Species

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As a kind of emerging nanomaterials, hydroxylated multi‐walled carbon nanotubes (OH‐MWCNTs) may interact with other pollutants in the aquatic environments and further influence the toxicity, transport and fate of them. So, evaluation of toxicity to arsenic in present of CNTs needs to receive much more attention. Current experiments were conducted to explore the underlying mechanisms for the OH‐MWCNTs induced arsenic [As(III) and As(V)] toxicity change to the aquatic organism D. magna under different pH levels. H2AsO3‐ and H2AsO4‐ were found to be the most toxic species for As(III) and As(V) to D. magna. It appears that the pH values are of the greatest importance when comparing the biological toxicity of As(III) and As(V). Furthermore, the effect of OH‐MWCNTs on arsenic toxicity to D. magna indicated that the presence of OH‐MWCNTs could enhance the toxicity of arsenic. The interactions of arsenic with OH‐MWCNTs were further investigated by conducting adsorption experiments. The adsorption capacity of As(V) by OH‐MWCNTs was found to be higher than As(III). To conclude, the adsorption of the certain arsenic species onto OH‐MWCNTs is crucial for a reliable interpretation of the enhanced toxicity. This article is protected by copyright. All rights reserved

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