Li Jin-Li, Wang Zhen-Hong, Yan Ya-Meng, Huang Bing, Luo Zhuan-Xi
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Huan Jing Ke Xue. 2017 Feb 8;38(2):832-836. doi: 10.13227/j.hjkx.201608134.
In the present study, the accumulation and biotransformation of arsenate in typical freshwater algae species were examined under long-term influence of titanium dioxide nanoparticles (nano-TiO). Results showed that different algae species had largely varied capacities of accumulation and biotransformation of arsenate. The arsenic accumulation reached (819.66±11.25) μg·g DW in , which was higher than that in of (355.95±8.31) μg·g DW. Nano-TiO increased arsenic accumulation in these exposed algae species, and then reduced arsenic levels in the relative culture media. Furthermore, nano-TiO improved arsenic biotransformation in the exposed algae, and the organic arsenic was dimethylarsinous acid (DMA) and monomethylarsonous acid (MMA) in and , respectively. Additionally, the release of organic arsenic was lower from the exposed algae in nano-TiO treatments than in the control, indicating that nano-TiO couldn't stimulate the release of organic arsenic from algae under long-term exposure. These results could improve insights on the ecological risk of nano-TiO associated with arsenic in the environment.
在本研究中，考察了典型淡水藻类物种中砷酸盐在二氧化钛纳米颗粒（纳米TiO₂）长期影响下的积累和生物转化情况。结果表明，不同藻类物种对砷酸盐的积累和生物转化能力差异很大。[此处缺少具体藻类物种名称]中的砷积累量达到(819.66±11.25) μg·g DW，高于[此处缺少具体藻类物种名称]中的(355.95±8.31) μg·g DW。纳米TiO₂增加了这些暴露藻类物种中的砷积累，然后降低了相关培养基中的砷含量。此外，纳米TiO₂改善了暴露藻类中砷的生物转化，在[此处缺少具体藻类物种名称]和[此处缺少具体藻类物种名称]中，有机砷分别为二甲基亚砷酸（DMA）和一甲基亚砷酸（MMA）。此外，纳米TiO₂处理下暴露藻类释放的有机砷低于对照，表明长期暴露下纳米TiO₂不会刺激藻类释放有机砷。这些结果有助于深入了解纳米TiO₂与环境中砷相关的生态风险。
