State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
J Hazard Mater. 2019 Sep 5;377:1-7. doi: 10.1016/j.jhazmat.2019.05.013. Epub 2019 May 13.
Due to growing production and use, release of nanoparticles (NPs) into the aquatic environment may pose a hazard to ecosystem. In this study, Microcystis aeruginosa was exposed to different concentrations (0.1, 1, 10, 50, 100 mg/L) of titanium dioxide (TiO) NPs to assess their impact on algae. Meanwhile, the production and release of microcystins (MCs) was determined. Results showed that TiO NPs significantly decreased the maximal photochemical efficiency of photosystem II, and thus inhibited the photosynthetic activity of M. aeruginosa. They also increased the content of reactive oxygen species (ROS) and malondialdehyde (MDA), indicating their oxidative damage on algae. Besides, TiO NPs at high concentrations (50 and 100 mg/L) aggregated on the algal surface and block the light, herein inhibited algae growth (16.03%±2.50% and 54.13%±0.93%) but induced the production (25.02%±1.23% and 114.43%±2.96%) and release (20.96%±13.30% and 12.10%±8.80%) of MCs. These results indicated that high concentrations of TiO2 NPs increased MCs concentration in water system, which may be harmful to aquatic ecosystem.
由于生产和使用的增加，纳米颗粒（NPs）释放到水环境中可能对生态系统构成危害。在这项研究中，将铜绿微囊藻暴露于不同浓度（0.1、1、10、50、100mg/L）的二氧化钛（TiO）纳米颗粒中，以评估它们对藻类的影响。同时，测定了微囊藻毒素（MCs）的产生和释放。结果表明，TiO NPs 显著降低了光系统 II 的最大光化学效率，从而抑制了铜绿微囊藻的光合作用。它们还增加了活性氧（ROS）和丙二醛（MDA）的含量，表明它们对藻类有氧化损伤。此外，高浓度（50 和 100mg/L）的 TiO NPs 在藻类表面聚集并阻挡光线，从而抑制藻类生长（16.03%±2.50%和 54.13%±0.93%），但诱导 MCs 的产生（25.02%±1.23%和 114.43%±2.96%）和释放（20.96%±13.30%和 12.10%±8.80%）。这些结果表明，高浓度的 TiO2 NPs 增加了水中系统中 MCs 的浓度，这可能对水生生态系统有害。
