[Toxicities of 30 ionic liquids to Vibrio qinghaiensis sp. Q67]

To systematically and effectively assess the toxic effects of "green solvent" ionic liquid (ILs) to a novel freshwater luminescent Vibrio qinghaiensis sp. Q67 (Q67), the toxicities of 30 ILs with different alkyl chain lengths, anions and cation skeletons (methylimidazolium, dimethylimidazolium and pyridinium) were determined using the microplate toxicity analysis. The observed dose-response curves (DRCs) were fitted by using the nonlinear least square regression. It was shown that the DRCs of 30 ILs could be well described by the Logit or Weibull function (R > 0.98, RMSE < 0.053). The toxicities of 30 ILs varied greatly and the pEC50 values of 30 ILs ranged from 1.01 to 5.48. The toxicities of ILs to Q67 mainly depended on the alkyl chain length and every two-carbon augment on the alkyl chain made the toxicity duplicate. The anions, cation skeletons and light absorbance of ILs showed no significant effect on the toxicities of ILs to Q67.