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- W1988554189 abstract "The acute toxicity of engineered nanoparticles (NPs) in aquatic environments at high concentrations has been well-established. This study demonstrates that, at a concentration generally considered to be safe in the environment, nano-TiO 2 remarkably enhanced the toxicity of copper to Daphnia magna by increasing the copper bioaccumulation. Specifically, at 2 mg L −1 nano-TiO 2 , the (LC 50 ) of Cu 2+ concentration observed to kill half the population, decreased from 111 μg L −1 to 42 μg L −1 . Correspondingly, the level of metallothionein decreased from 135 μg g −1 wet weight to 99 μg g −1 wet weight at a Cu 2+ level of 100 μg L −1 . The copper was found to be adsorbed onto the nano-TiO 2 , and ingested and accumulated in the animals, thereby causing toxic injury. The nano-TiO 2 may compete for free copper ions with sulfhydryl groups, causing the inhibition of the detoxification by metallothioneins. ► This study demonstrates that, at a concentration generally considered to be safe in the environment, nano-TiO 2 remarkably enhanced the toxicity of copper to Daphnia magna . ► The copper was found to be adsorbed onto the nano-TiO 2 , and ingested and accumulated in the Daphnia magna , thereby causing toxic injury. ► The nano-TiO 2 may compete for free copper ions with sulfhydryl groups, causing the inhibition of the detoxification mechanism of metallothionein. The nano-TiO 2 remarkably enhanced the toxicity of copper to Daphnia magna . The nano-TiO 2 may compete for free copper ions with sulfhydryl groups, causing the inhibition of the detoxification mechanism of metallothionein." @default.
- W1988554189 created "2016-06-24" @default.
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- W1988554189 date "2011-03-01" @default.
- W1988554189 modified "2023-10-16" @default.
- W1988554189 title "Nano-TiO2 enhances the toxicity of copper in natural water to Daphnia magna" @default.
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- W1988554189 doi "https://doi.org/10.1016/j.envpol.2010.11.030" @default.
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