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Enhanced toxicity of atrazine to Daphnia magna in the presence of nano-CeO2 |
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| Authors: | Zhaoxiang Han Jiaying Li Wei Bao Jiahong Wang |
| Institution: | 1. School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, 222005, China 2. Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Yancheng, 224002, China 3. Department of Chemistry and Applied Chemistry, Changji University, Changji, 831100, China 4. School of the Environment, Nanjiing University, Nanjiing, 210008, China |
| Abstract: | In this study, aquatic toxic effect of atrazine, and nano-CeO2, the accumulation, reproduction and adsorption of atrazine onto nano-CeO2 and the facilitated transport of atrazine into D. magna by nano-CeO2 were examined. The results showed that atrazine concentrations of 3.0, 4.0, and 10.0 mg/L exhibited 43%, 56%, 68% mortalities, respectively, which indicated the mortality was 56% while the concentration of nano-CeO2 was 4.0 mg/L. D. magna accumulated considerably more atrazine when exposed to atrazine-contaminated water in the presence of nano-CeO2. At the same time, atrazine and nano-CeO2 yielded a significant reduction of the reproduction rate at all concentrations tested. What is more, the co-exposure of nano-CeO2 and atrazine was observed to significantly decrease the reproduction rate of D. magna, and atrazine adsorbed on nano-CeO2 quickly. Therefore, attention should be paid to their associations with other contaminants for the risk assessment of nano-CeO2 and it is worthy of notice that the sorption of atrazine on nano-CeO2 would enhance the toxicity of atrazine to D. magna. |
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