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Effects of CeO2 Nanoparticles on Microcystis aeruginosa Growth and Microcystin Production.
Bulletin of Environmental Contamination and Toxicology ( IF 1.657 ) Pub Date : 2020-04-18 , DOI: 10.1007/s00128-020-02842-9
Guiqi Zhao,Di Wu,Shenglai Cao,Wenchao Du,Ying Yin,Hongyan Guo

The interaction between metal oxide nanoparticles and toxin-producing cyanobacteria is relatively unknown. The present work exposed Microcystis sp.7806 to different concentrations of cerium oxide nanoparticles (CeO2 NPs) (1 mg/L, 10 mg/L and 50 mg/L), and evaluated the growth, photosynthetic activity, reactive oxygen species level, and the extra-(intra-) cellular microcystin-LR (MC-LR) contents. The particle size, zeta potential and cerium ions released into the medium were analyzed. Results showed 10 mg/L NP treatment promoted algae growth but slightly inhibited the photosynthetic yield of algae, and the 50 mg/L treatment reduced algae biomass. The algal cells remarkably responded to oxidative stress at higher concentrations (10 mg/L and 50 mg/L). CeO2 NPs largely increased the intracellular MC-LR content at 50 mg/L, and significantly reduced the extracellular MC-LR content at any concentration. This demonstrates CeO2 NPs may pose an ecological risk potential during harmful algal blooms by stimulating toxin production.
更新日期:2020-04-18

 

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