期刊
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
卷 64, 期 4, 页码 643-651出版社
SPRINGER
DOI: 10.1007/s00244-012-9859-z
关键词
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资金
- Shandong Outstanding Young Scientist Award Fund [BS2010SF005]
- Dr. Start Fund of Linyi University [BS201009]
- Project of Shandong Province Higher Educational Science and Technology Program [J10LE57]
The present study focuses on the biochemical responses of the aquatic plant duckweed (Spirodela polyrhiza L.) to zinc oxide nanoparticles (ZnO NPs). Laboratory experiments were performed using a 96-h exposure to 25-nm NPs at different concentrations (0, 1, 10, and 50 mg/L). Growth, chlorophyll-to-pheophytin ratio (D665/D665a) and activities of superoxide dismutase, catalase, peroxidase (POD), and Na+, K+-ATPase were determined as indices to evaluate the toxicity of NPs in the culture medium. To understand better whether the Zn2+ released from the ZnO NP suspensions plays a key role in toxicity of the NPs, we investigated particle aggregation and dissolution in the medium. Furthermore, two exposure treatments for the group with the highest concentration (50 mg/L) were performed: (1) exposure for the full 96 h (50a treatment) and (2) the medium being replaced with culture medium without NPs after 12 h (50b treatment). Our results indicate that ZnO NPs induced adverse effects in S. polyrhiza at the concentration of 50 mg/L in the culture medium. Zn2+ released from the NPs might be the main source of its toxicity to this species.
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