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Imidozolium Ionic Liquids as Mobile Phase Additives in Reversed Phase Liquid Chromatography for the Analysis of Anions

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Abstract

An analytical method was developed for the simultaneous determination of bromide, thiosulfate, thiocyanate, hexafluorophosphate, trifluoroacetate and trifluoromethanesulfonate anions by reversed phase liquid chromatography with indirect ultraviolet detection using imidazolium ionic liquids as mobile phase additives. The effects of imidazolium ionic liquids, organic solvent, column temperature and detection wavelength on separation and detection of the anions were investigated and the mechanism was discussed, in which imidazolium ionic liquids acted as ion pair reagent and background ultraviolet absorption reagent of indirect ultraviolet detection. The suitable chromatographic conditions were methanol/0.5 mmol L−1 1-ethyl-3-methyl imidazolium tetrafluoroborate aqueous solution (10/90, v/v) as mobile phase, column temperature of 35 °C and flow rate of 1.0 mL min−1. The results indicated that the successful separation of the six anions within 10 min was achieved and the symmetry of peaks was satisfactory. Under these conditions, the detection limits of anions ranged from 0.02 to 0.52 mg L−1. Relative standard deviations for peak area and retention time were less than 0.24 and 0.46%, respectively. The method was applied to the determination of ionic liquid samples synthesized by chemistry laboratory. The results were accurate and reliable, and could meet the requirements for quantitative analysis.

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Acknowledgements

This work was supported by the Natural Science Foundation of Heilongjiang Province (Grant no. B201307).

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Authors and Affiliations

  1. Heilongjiang Province Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China

    Ya-nan Zhang & Hong Yu

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  1. Ya-nan Zhang
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  2. Hong Yu
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Correspondence to Hong Yu.

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This study was funded by the Natural Science Foundation of Heilongjiang Province (Grant number B201307).

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Zhang, Yn., Yu, H. Imidozolium Ionic Liquids as Mobile Phase Additives in Reversed Phase Liquid Chromatography for the Analysis of Anions. Chromatographia 80, 1615–1622 (2017). https://doi.org/10.1007/s10337-017-3409-9

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  • DOI: https://doi.org/10.1007/s10337-017-3409-9

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