期刊
ENVIRONMENTAL POLLUTION
卷 193, 期 -, 页码 165-172出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.06.027
关键词
ZnO nanoparticles; UV radiation; Reactive oxygen species (ROS); Photo-induced dissolution; Toxicity
资金
- National Research Council Research Associateship Award at the U.S. Environmental Protection Agency, Mid-Continent Ecology Division Laboratory
The present study investigated the impact of solar UV radiation on ZnO nanoparticle toxicity through photocatalytic ROS generation and photo-induced dissolution. Toxicity of ZnO nanoparticles to Daphnia magna was examined under laboratory light versus simulated solar UV radiation (SSR). Photocatalytic ROS generation and particle dissolution were measured on a time-course basis. Two toxicity mitigation assays using CaCl2 and N-acetylcysteine were performed to differentiate the relative importance of these two modes of action. Enhanced ZnO nanoparticle toxicity under SSR was in parallel with photocatalytic ROS generation and enhanced particle dissolution. Toxicity mitigation by CaCl2 to a less extent under SSR than under lab light demonstrates the role of ROS generation in ZnO toxicity. Toxicity mitigation by N-acetylcysteine under both irradiation conditions confirms the role of particle dissolution and ROS generation. These findings demonstrate the importance of considering environmental solar UV radiation when assessing ZnO nanopartide toxicity and risk in aquatic systems. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据