John Wiley & Sons, Ltd.

Assessing toxicity of copper nanoparticles across five cladoceran species

Due to ever increasing applications, nanoparticles will eventually end up in the environment. However, currently no common principle has been established to help understand the toxicity of NPs across species. Therefore, it is difficult to estimate the potential risks of nanoparticles to untested species in the environment. We exposed four different sizes of copper nanoparticles and one submicron sized copper particle to five cladoceran species (Daphnia magna, Daphnia pulex, Daphnia galeata, Ceriodaphnia dubia and Chydorus sphaericus) to investigate if morphological attributes of species can help to assess the acute toxicity of copper nanoparticles across species. Results showed that rod shaped copper nanoparticles caused much lower toxicity to all species than spherical copper nanoparticles. Both the particles and ions contributed to the total toxicity of the CuNPs suspensions. Moreover, the toxicity caused by particles in five different copper suspensions increases with decreasing body length, surface area and body volume of neonates of five cladoceran species. Especially the correlations between body volume of the five cladoceran species tested and the corresponding toxicity caused by five different CuNPs were statistically significant and in all cases Radj2 was higher than 0.51 (p < 0.001). The highest correlation was found between the body volume and the toxicity of the 78 nm CuNPs (Radj2 = 0.95, p < 0.001). To conclude, the correlations between attributes of cladoceran species and the toxicity of CuNPs reported in this study evoke the possibility to assess and extrapolate the toxicity of NPs across species with similar attributes. This article is protected by copyright. All rights reserved

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