Influence of titanium dioxide nanoparticles on cadmium and lead bioaccumulations and toxicities to Daphnia magna
Autor: | Markus Sillanpää, Ling Li, Eija Schultz |
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Rok vydání: | 2017 |
Předmět: |
Materials science
Daphnia magna 0211 other engineering and technologies chemistry.chemical_element Bioengineering 02 engineering and technology 010501 environmental sciences 01 natural sciences Daphnia Adsorption General Materials Science Chronic toxicity 0105 earth and related environmental sciences 021110 strategic defence & security studies Cadmium biology technology industry and agriculture General Chemistry Condensed Matter Physics biology.organism_classification Atomic and Molecular Physics and Optics Bioavailability chemistry Modeling and Simulation Environmental chemistry Bioaccumulation Toxicity |
Zdroj: | Journal of Nanoparticle Research. 19 |
ISSN: | 1572-896X 1388-0764 |
Popis: | Titanium dioxide nanoparticles (TiO2 NPs) have attracted considerable concerns due to the increasing production and widespread applications, while their influences on other co-existing pollutants in real environment are not well studied. In this paper, the colloidal stability of TiO2 NPs in the exposure medium was first evaluated, and then, the medium was modified so that TiO2 NP suspension remained stable over the exposure period. Finally, using the optimized exposure medium, the effects of cadmium (Cd) and lead (Pb) on Daphnia magna both in the absence and presence of TiO2 NPs were investigated. Results showed that 2 mg L−1 of TiO2 NPs was well dispersed in 1:20 diluted Elendt M7 medium without EDTA, and no immobility was observed. The presence of the nanoparticles increased the bioaccumulation and toxicity of Cd to the daphnias. On the contrary, while Pb bioaccumulation was enhanced by three to four times, toxicity of Pb was reduced in the presence of TiO2 NPs. The decreased toxicity of Pb was more likely attributed to the decreased bioavailability of free Pb ion due to adsorption and speciation change of Pb in the presence of TiO2 NPs. Additionally, surface-attached TiO2 NPs combined with adsorbed heavy metals caused adverse effects on daphnia swimming and molting behavior, which is supposed to lead to chronic toxicity. |
Databáze: | OpenAIRE |
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