John Wiley & Sons, Ltd.

The effects of hydroxylated multi‐walled carbon nanotubes on the toxicity of nickel to Daphnia magna under different pH levels

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Hydroxylated multi‐walled carbon nanotubes (F‐MWCNTs), with large amount of hydrophilic groups attached on the nanoparticle surface, have caused considerable concerns of their inevitable releases into the aquatic environments. As one of the F‐MWCNTs, hydroxylated multi‐walled carbon nanotubes (OH‐MWCNTs) may interact with other contaminants such as heavy metals and even influence their toxicity, fate and transport. In the present study, the stability of OH‐MWCNTs suspended in aerated Nanjing tap water (moderately hard) was evaluated first using the spectrophotometric method. The toxicity of OH‐MWCNTs to Daphnia magna (D. magna) was determined and nontoxic concentrations were used in the acute toxicity, accumulation and sorption tests. It was found that OH‐MWCNTs increased the Ni toxicity in a concentration‐dependent manner under different pH levels. Ni adsorption onto the OH‐MWCNTs and the uptake of OH‐MWCNTs increased the exposure of D. magna to Ni, which was verified by the sorption and accumulation tests conducted under different pH levels. The lower pH level contributed to a higher overall toxicity, which could be interpreted by the increasing amount of Ni adsorption onto OH‐MWCNTs with the decreasing pH levels. Environ Toxicol Chem © 2014 SETAC

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