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Issue 1, 2008
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Influence of anions on the toxic effects of ionic liquids to a phytoplankton Selenastrum capricornutum

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Abstract

Investigations on the influence of anions of ionic liquids, with respect to toxicity and ecotoxicity, have been reported; however, no consistent conclusion has been drawn. The aim of this study was to elucidate the influence of the anionic component, using the alga Selenastrum capricornutum, by assessing the toxicity of various anions associated with imidazolium-based ionic liquids as well as alkali salts. Additionally, the hydrolysis of fluoride-containing ionic liquids, i.e., 1-butyl-3-methylimidazolium [BMIM], incorporated with tetrafluoroborate, hexafluorophosphate and hexafluoroantimonate, was also estimated. The results obtained revealed that imidazolium-based ionic liquids were more toxic than their corresponding alkali salts. In both cases, SbF6 and PF6 were identified as the most toxic anions. In general, Selenastrum capricornutum was sensitive to the anion moieties in the order: SbF6 > PF6 > BF4 > CF3SO3 > C8H17OSO3 > Br ≈ Cl. With regard to the hydrolytic effect, [BMIM][SbF6] generated a greater amount of fluoride compared with [BMIM][BF4], but no fluoride formation occurred with the hexafluorophosphate.

Graphical abstract: Influence of anions on the toxic effects of ionic liquids to a phytoplankton Selenastrum capricornutum

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Publication details

The article was received on 12 Apr 2007, accepted on 08 Oct 2007 and first published on 26 Oct 2007


Article type: Paper
DOI: 10.1039/B705520J
Citation: Green Chem., 2008,10, 67-72
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    Influence of anions on the toxic effects of ionic liquids to a phytoplankton Selenastrum capricornutum

    C. Cho, T. Phuong Thuy Pham, Y. Jeon and Y. Yun, Green Chem., 2008, 10, 67
    DOI: 10.1039/B705520J

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