The (eco)toxicity of the most common ionic liquid anions like [N(CN)(2)](-), [C(CN)(3)](-), [B(CN)(4)](-), [(CF(3)SO(2))(2)N](-), [(C(2)F(5))(3)PF(3)](-) was investigated in test systems of different trophic level. In the same order, and thus with increasing hydrophobicity, a trend of higher toxicity was found. Especially the [(C(2)F(5))(3)PF(3)](-) moiety poses a significant hazard towards aquatic organisms.
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Steudte et al. (2012) studied this question.
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