title: Distribution, Bioaccumulation, Trophic Transfer, and Influences of CeO2Nanoparticles in a Constructed Aquatic Food Web.
abstract: In view of the final destination of nanomaterials, the water system would be an important sink. However, the environmental behavior of nanomaterials is rather confusing due to the complexity of the real environment. In this study, a freshwater ecosystem, including water, sediment, water lettuce, water silk, Asian clams, snails, water fleas, Japanese medaka, and Yamato shrimp, was constructed to study the distribution, bioaccumulation, and potential impacts of CeO2nanoparticles (CeO2NPs) via long-term exposure. The results demonstrated most of the CeO2NPs deposited in the sediment (88.7%) when the partition approached to the constant 30 days later. The bioaccumulated Ce in six tested biota species was negatively correlated with its trophic level, showing no biomagnification of CeO2NPs through this food web. CeO2NP exposure induced visual abnormalities in hydrophytes, including chlorophyll loss in water silk and water lettuce, ultrastructural changes in pyrenoids of water silk, and root elongation in water lettuce. The generation of hydroxyl radical (·OH) and cell-wall loosening induced by CeO2NP exposure might mediate the root growth in water lettuce. The findings on the environmental behavior of CeO2NPs in water system have provided useful information on the risk assessment of nanomaterials.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Xingchen
authors.initials: X
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Miao
authors.initials: M
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Dan
authors.initials: D
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Aifeng
authors.initials: A
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Xingwang
authors.initials: X
authors.lastname: Hou
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Fang
authors.initials: F
authors.lastname: Hao
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|Institute of Environment and Health, Jianghan University , Wuhan 430000, P. R. China.
authors.forename: Yanmin
authors.initials: Y
authors.lastname: Long
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Qunfang
authors.identifier: http://orcid.org/0000-0003-2521-100X
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P.R. China.|College of Resources and Environment, University of Chinese Academy of Sciences , Beijing 100049, P.R. China.
authors.forename: Guibin
authors.initials: G
authors.lastname: Jiang
mesh_terms: D000818:Animals; D002563:Cerium / Q000737:chemistry*; D017753:Ecosystem; D020387:Food Chain; D005618:Fresh Water; D053768:Metal Nanoparticles / Q000737:chemistry
chemical_list: D002563:Cerium