期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 327, 期 -, 页码 64-70出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.12.044
关键词
ZnO nanoparticles; Water-sediment; CO2; Fish; Toxicology
资金
- National Natural Science Foundation of China [21177058, 21307056]
- Program for New Century Excellent Talents in University [NCET-12-0266]
- Environmental Protection Agency [DBI-1266377]
- National Institutes on Minority Health and Health Disparities (NIMHD), a component of the National Institutes of Health (NIH) [2G12MD007592]
- USDA [2011-38422-30835]
- NSF ERC on Nanotechnology-Enabled Water Treatment [EEC-1449500, CHE-0840525, DBI-1429708]
- Academy of Applied Science/US Army Research Office, Research and Engineering Apprenticeship program (REAP) at UTEP [W11NF-10-2-0076, 13-7]
- National Science Foundation
Concerns about the environmental safety of metal-based nanoparticles (MNPs) in aquatic ecosystems are increasing. Simultaneously, elevated atmospheric CO2 levels are a serious problem worldwide, making it possible for the combined exposure of MNPs and elevated CO2 to the ecosystem. Here we studied the toxicity of nZnO to goldfish in a water-sediment ecosystem using open-top chambers flushed with ambient (400 +/- 10 mu L/L) or elevated (600 +/- 10 mu L/L) CO2 for 30 days. We measured the content of Zn in suspension and fish, and analyzed physiological and biochemical changes in fish tissues. Results showed that elevated CO2 increased the Zn content in suspension by reducing the pH value of water and consequently enhanced the bioavailability and toxicity of nZnO. Elevated CO2 led to higher accumulation of Zn in fish tissues (increased by 43.3%, 86.4% and 22.5% in liver, brain and muscle, respectively) when compared to ambient. Elevated CO2 also intensified the oxidative damage to fish induced by nZnO, resulting in higher ROS intensity, greater contents of MDA and MT and lower GSH content in liver and brain. Our results suggest that more studies in natural ecosystems are needed to better understand the fate and toxicity of nanoparticles in future CO2 levels. (C) 2016 Elsevier B.V. All rights reserved.
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