Journal
JOURNAL OF SEPARATION SCIENCE
Volume 33, Issue 13, Pages 1991-1996Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201000199
Keywords
Analysis; Anions; Cations; Ionic liquids; Isotachophoresis
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Funding
- 7th Framework Programme within support for training and career development of researchers (MarieCurie) Networks for Initial Training (ITN) under the project MINILUBES [PITN-GA-2008-216011]
- Polish Ministry of Research and Higher Education [DS 8200-4-0085-10, NN204154436]
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Simple, selective and sensitive isotachophoretic methods for the analysis of ionic liquid (IL) compartments were developed in this study. A leading electrolyte containing 10 mM L-histidine + 10 mM histidine hydrochloride and a terminating electrolyte containing 5 mM glutamic acid + 5 mM L-histidine were selected to separate nitrate(V), chlorate(V), hexafluorophosphate, dicyanimide, trifluoromethanesulfonate, phosphate(V) and bis(trifluoromethanesulfonyl)imide in anionic mode. In contrast. seven short-chain alkylimidazolium, alkylpyrrolidinium, alkylpyridinium and non-chromophoric tetraalkylammonium and tetraalkylphosphonium IL cations were separated with 10 mM potassium hydroxide + 10 mM acetic acid as leading electrolyte, and 10 mM + 10 mM acetate as terminating electrolyte. Both methods were optimized and validated with good analytical performance parameters. LOD was about 3-5 mu M, and the repeatability lay in the range of 1.06-5.59%. These methods were evaluated for their applicability to the analysis of soil samples and freshwater contaminated with ILs. In light of hitherto the absence of reports on the determination of non-chromophoric IL cations, this study delivers for the first time a universal method enabling analysis of these species. Moreover, as there is still significant lack of methodologies of IL anion analysis, the obtained results offer an interesting alternative in that matter.
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