期刊
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
卷 35, 期 7, 页码 1852-1859出版社
WILEY
DOI: 10.1002/etc.3340
关键词
Hydroxylated multiwalled carbon nanotubes; Arsenic species; Toxicity; Adsorption; Daphnia magna
资金
- National Natural Science Foundation of China [41071319, 21377051]
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2012ZX07506-001]
- Deanship of Scientific Research at King Saud University [RGP-VPP-240]
As a type of emerging nanomaterial, hydroxylated multiwalled carbon nanotubes (OH-MWCNTs) may interact with other pollutants in the aquatic environments and further influence their toxicity, transport, and fate. Thus, evaluation of toxicity to arsenic in the presence of CNTs needs to receive much more attention. The present study was conducted to explore the underlying mechanisms of OH-MWCNT-induced arsenic (As[III] and As[V]) toxicity changes in the aquatic organism Daphnia magna at different pH levels. The most toxic species for As(III) and As(V) to D. magna were found to be H2AsO3- and H2AsO4-. It appeared that the pH values were of greatest importance when the biological toxicity of As(III) and As(V) was compared. Furthermore, the effects of OH-MWCNTs on arsenic toxicity to D. magna indicated that the presence of OH-MWCNTs could enhance the toxicity of arsenic. The interactions of arsenic with OH-MWCNTs were further investigated by conducting adsorption experiments. The adsorption capacity of As(V) by OH-MWCNTs was found to be higher than that of As(III). To conclude, adsorption of certain arsenic species onto OH-MWCNTs is crucial for a reliable interpretation of enhanced toxicity. Environ Toxicol Chem 2016;35:1852-1859. (c) 2016 SETAC
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