期刊
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
卷 31, 期 9, 页码 2099-2107出版社
WILEY-BLACKWELL
DOI: 10.1002/etc.1916
关键词
Titanium dioxide nanoparticles; Phototoxicity; Reactive oxygen species; Solar UV radiation; Daphnia magna
资金
- U.S. Environmental Protection Agency, Mid-Continent Ecology Division Laboratory
Generation of reactive oxygen species (ROS) by titanium dioxide nanoparticles (nano-TiO2) and its consequent phototoxicity to Daphnia magna were measured under different solar ultraviolet (UV) spectra by applying a series of optical filters in a solar simulator. Removing UV-B (280320?nm) from solar radiation had no significant impact on photocatalytic ROS production of nano-TiO2, whereas removal of UV-A (320400?nm) decreased ROS production remarkably. Removal of wavelengths below 400?nm resulted in negligible ROS production. A linear correlation between ROS production and D. magna immobilization suggests that photocatalytic ROS production may be a predictor of phototoxicity for nano-TiO2. Intracellular ROS production within D. magna was consistent with the immobilization of the organism under different solar UV spectra, indicating that oxidative stress was involved in phototoxicity. The dependence of nano-TiO2 phototoxicity on environmentally realistic variations in solar radiation suggests that risk assessment of these nanomaterials requires careful evaluation of exposure conditions in the environment. Environ. Toxicol. Chem. 2012; 31: 20992107. (c) 2012 SETAC
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