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Toxicity mechanism of cerium oxide nanoparticles on cyanobacteria Microcystis aeruginosa and their ecological risks
Authors:Wu  Di  Zhang  Juanjuan  Du  Wenchao  Yin  Ying  Guo  Hongyan
Institution:1.State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
;2.School of Environment, Nanjing Normal University, Nanjing, 210023, China
;3.Joint International Research Centre for Critical Zone Science, University of Leeds and Nanjing University, Nanjing University, Nanjing, 210023, China
;
Abstract:

The extensive application of cerium oxide nanoparticles (CeO2 NPs), a type of rare earth nanomaterial, led to pollution into aquatic environments. Cyanobacteria, a significant component of freshwater ecosystems, can interact with CeO2 NPs. However, little attention has been paid as to whether CeO2 NPs will have adverse effects on cyanobacteria. In the present study, Microcystis aeruginosa (FACHB-942) was exposed to different concentrations (0, 1, 10, and 50 mg/L) of CeO2 NPs. Results showed 50 mg/L CeO2 NPs inhibited algal growth (11.48%?±?5.76%), suppressed photosynthesis and induced the generation of reactive oxygen species (ROS) after 72 h exposure. The toxicity mechanism is the adsorption of CeO2 NPs on cell surface, the ROS formation and the intracellular Ce. Additionally, the intracellular microcystins (MCs) content was significantly induced (11.84%?±?1.47%) by 50 mg/L CeO2 NPs, while no significance was found in 1 and 10 mg/L CeO2 NP treatments. Results indicated high concentrations of CeO2 NPs could be toxic to algae through the adverse effects on algal growth and photosynthesis. Moreover, the promoted MCs production could also pose a threat to freshwater ecosystems due to the possible release into the environment.

Keywords:
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