Issue 1, 2008

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

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

Article information

Article type
Paper
Submitted
12 Apr 2007
Accepted
08 Oct 2007
First published
26 Oct 2007

Green Chem., 2008,10, 67-72

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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