[Accumulation and Biotransformation in Typical Freshwater Algae Species Influenced by Titanium Dioxide Nanoparticles Under Long-term Exposure].

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.