期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 122, 期 -, 页码 83-90出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2015.07.010
关键词
1-alkyl-3-methylimidazolium chloride ionic liquid; Scenedesmus obliquus; Growth inhibition rate; Cellular membrane permeability; Ultrastructure
资金
- National Natural Science Foundation of China [21377115]
- Zhejiang Provincial Natural Science Foundation of China [Y5100376]
- University Student's Science and Technology Innovation Project of the Zhejiang Provincial [3070KZN0215088]
- Graduate Student's Science and Technology Project of Zhejiang Gongshang University [1260XJ1513145]
The low volatility of ionic liquids effectively eliminates a major pathway for environmental release and contamination; however, the good solubility, low degree of environmental degradation and biodegradation of ILs may pose a potential threat to the aquatic environment. The growth inhibition of the green alga Scenedesmus obliquus by five 1-alkyl-3-methylimidazolium chloride ionic liquids (ILs) ([C(n)mim]Cl, n=6, 8, 10, 12, 16) was investigated, and the effect on cellular membrane permeability and the ultrastructural morphology by ILs ([C(n)mim]Cl, n=8, 12, 16) were studied. The results showed that the growth inhibition rate increased with increasing IL concentration and increasing alkyl chain lengths. The relative toxicity was determined to be [C(6)mim]Cl < [C(8)mim]Cl < [C(10)mim]Cl < [C(12)mim]Cl < [C(16)mim]Cl. The algae were most sensitive to imidazolium chloride ILs at 48 h according to the results from the growth inhibition rate and cellular membrane permeability tests. The ultrastructural morphology showed that the ILs had negative effects on the cellular morphology and structure of the algae. The cell wall of treated algae became wavy and separated from the cell membrane. Chloroplast grana lamellae became obscure and loose, osmiophilic material was deposited in the chloroplast, and mitochondria and their cristae swelled. Additionally, electron-dense deposits were observed in the vacuoles. (C) 2015 Elsevier Inc. All rights reserved.
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