How to Analyze Ionic Liquid Anions? Investigation into the Application of Suppressed and Non-Suppressed Ion Chromatography

Piotr Stepnowski; Aleksandra Markowska

doi:10.1071/CH08019

RESEARCH ARTICLE

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How to Analyze Ionic Liquid Anions? Investigation into the Application of Suppressed and Non-Suppressed Ion Chromatography

Piotr Stepnowski ^A ^B and Aleksandra Markowska ^A

+ Author Affiliations

- Author Affiliations

^A Faculty of Chemistry, University of Gdańsk, Sobieskiego 18, PL-80-952 Gdańsk, Poland.

^B Corresponding author. Email: sox@chem.univ.gda.pl

Australian Journal of Chemistry 61(6) 409-413 https://doi.org/10.1071/CH08019
Submitted: 18 January 2008 Accepted: 21 May 2008 Published: 19 June 2008

Abstract

In the present study, two reliable and accurate methods have been developed for the quantitative and qualitative determination of ionic liquid anions based on suppressed and non-suppressed ion chromatography. They were applied to the separation and analysis of chloride, bromide, p-tosylate, tetrafluoroborate, hexafluorophosphate, dicyanamide, and bis(trifluoromethanesulfonyl)imide. In the non-suppressed mode, the influence of the concentration of phthalic acid, acetonitrile, and pH of the mobile phase on the retention and separation of analytes were investigated; 8 mM solution of phthalic acid with 20% v/v of acetonitrile (pH = 4) can be regarded as the optimal mobile phase in this separation mode. In the suppressed mode, various compositions of a carbonate/bicarbonate buffer solution with and without acetonitrile were also assessed; 3.2 mM Na₂CO₃/1 mM NaHCO₃ and 25% acetonitrile were found to act as the optimal mobile phase. Under the analytical conditions developed, both methods provided very good separation and symmetrical peak shapes of all compounds within the reasonable time-frame of 30 min. The analytical performance parameters of both methods were good; however sensitivity will be further improved in future studies. Moreover, the suppressed separation mode was successfully applied to the analysis of tetrafluoroborate in a soil aquifer.

Acknowledgement

Financial support was provided by the Polish Ministry of Research and Higher Education under grants 2P04G 083 29, 2P04G 118 29, and DS 8200–4-0085–7. The grant of the University of Gdańsk no. BW 8000–5-0404–8 is greatly acknowledged.

References

How to Analyze Ionic Liquid Anions? Investigation into the Application of Suppressed and Non-Suppressed Ion Chromatography

Abstract

Acknowledgement

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