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Determination of Imidazolium Ionic Liquid Cations by Ion-Pair Chromatography Using a Monolithic Column and Direct Conductivity Detection

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Abstract

Determination of four imidazolium ionic liquid cations by ion-pair chromatography was carried out using direct conductivity detection. Chromatographic separations were performed on a silica-based monolithic column with 1-heptanesulfonic acid sodium + acetonitrile + citric acid as eluent. Carbon number rule and influence of acetonitrile on the retention of imidazolium cations were discussed. Detection limits (S/N = 3) for the cations were 2.1–55.9 mg L−1. Relative standard deviations (RSD, n = 5) for peak areas were less than 3.0%. The method has been successfully applied to the determination of two ionic liquids synthesized by organic chemistry lab.

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Acknowledgments

This work was supported by the Natural Science Foundation of Heilongjiang Province (Grant No. B200909) and the Ministry of Education of Heilongjiang Province (Grant No. 11541088).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Harbin Normal University, 150025, Harbin, People’s Republic of China

    Wei Gao, Hong Yu & Shuang Zhou

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  1. Wei Gao
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  2. Hong Yu
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  3. Shuang Zhou
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Correspondence to Hong Yu.

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Gao, W., Yu, H. & Zhou, S. Determination of Imidazolium Ionic Liquid Cations by Ion-Pair Chromatography Using a Monolithic Column and Direct Conductivity Detection. Chroma 71, 475–479 (2010). https://doi.org/10.1365/s10337-010-1478-0

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  • DOI: https://doi.org/10.1365/s10337-010-1478-0

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