Hu Ji, Wang Jianmin, Liu Shuxia, Zhang Zhechao, Zhang Haifeng, Cai Xiaoxia, Pan Jianming, Liu Jingjing
The Second Institute of Oceanography, State Oceanic Administration, Laboratory of Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China.
Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA.
J Environ Sci (China). 2018 Apr;66:208-215. doi: 10.1016/j.jes.2017.05.026. Epub 2017 May 25.
TiO nanoparticles (NPs) could adversely impact aquatic ecosystems. However, the aggregation of these NPs could attenuate this effect. In this work, the biological effects of TiO NPs on a marine microalgae Isochrysis galbana were investigated. The aggregation kinetics of TiO NPs under different conditions was also investigated to determine and understand these effects. Results showed that, though TiO NPs had no obvious impact on the size and reproducibility of algal cells under testing conditions, they caused a negative effect on algal chlorophyll, which led to a reduction in photosynthesis. Furthermore, fast aggregation of TiO NPs occurred under all conditions, especially at the pH close to the pH. Increasing ionic strength and NP concentration also enhanced the aggregation rate. The aggregation and the following sedimentation of TiO NPs reduced their adverse effects on I. galbana.
二氧化钛纳米颗粒（NPs）可能会对水生生态系统产生不利影响。然而，这些纳米颗粒的聚集可以减弱这种影响。在这项工作中，研究了二氧化钛纳米颗粒对海洋微藻球等鞭金藻的生物学效应。还研究了不同条件下二氧化钛纳米颗粒的聚集动力学，以确定并理解这些效应。结果表明，尽管在测试条件下二氧化钛纳米颗粒对藻类细胞的大小和繁殖能力没有明显影响，但它们对藻类叶绿素产生了负面影响，从而导致光合作用下降。此外，在所有条件下二氧化钛纳米颗粒都发生了快速聚集，尤其是在接近藻类细胞pH值的pH条件下。增加离子强度和纳米颗粒浓度也提高了聚集速率。二氧化钛纳米颗粒的聚集及其随后的沉降降低了它们对球等鞭金藻的不利影响。
