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• W2027243539 endingPage "476" @default.
• W2027243539 startingPage "469" @default.
• W2027243539 abstract "Titanium dioxide nanoparticles (nano-TiO2) are now widely applied in consumer products, and the dispersion of nano-TiO2 may adsorb metals and modify their behavior and bioavailability in the aquatic environment. In the present study, the aqueous uptake, dietary assimilation efficiency (AE), and efflux rate constant (ke) of two toxic metals (cadmium-Cd, and zinc-Zn) adsorbed on nano-TiO2 in a freshwater zooplankton Daphnia magna were quantified. The biokinetics was then compared to daphnids that were exposed only to dissolved metals as controls. The aqueous uptake of Cd and Zn involved an initial rapid uptake and then an apparent saturation, and the uptake of metals was accompanied by an ingestion of nano-TiO2. The AEs of Cd and Zn adsorbed on nano-TiO2 were 24.6 ± 2.4–44.5 ± 3.7% and 30.4 ± 3.4–51.8 ± 5.0%, respectively, and decreased with increasing concentrations of nano-TiO2. Furthermore, the difference between the AEs of Cd and Zn indicated that the desorption of Cd and Zn from nano-TiO2 may have occurred within the gut of daphnids. With the use of algae as carrier, the AEs of Cd and Zn adsorbed on nano-TiO2 were significantly higher than those of Cd and Zn directly from nano-TiO2. The efflux rate constants of Cd and Zn adsorbed on nano-TiO2 in the zooplankton were significantly lower than those of Cd and Zn not adsorbed on nano-TiO2. Our study shows that the uptake and retention of toxic metals is enhanced when they are adsorbed on nano-TiO2, and suggests more attention be paid to the potential influences of nano-TiO2 on the bioavailability and toxicity of other contaminants." @default.
• W2027243539 created "2016-06-24" @default.
• W2027243539 creator A5045680818 @default.
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• W2027243539 date "2011-12-01" @default.
• W2027243539 modified "2023-10-16" @default.
• W2027243539 title "Role of Titanium Dioxide Nanoparticles in the Elevated Uptake and Retention of Cadmium and Zinc in <i>Daphnia magna</i>" @default.
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• W2027243539 doi "https://doi.org/10.1021/es202110d" @default.
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• W2027243539 hasPublicationYear "2011" @default.
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