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IC Determination of Halide Impurities in Ionic Liquids

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Hao, F and Haddad, PR and Ruther, T (2008) IC Determination of Halide Impurities in Ionic Liquids. Chromatographia, 67 (5-6). pp. 495-498. ISSN 0009-5893 (Print) 1612-1112 (Online)

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Abstract

An ion chromatographic (IC) method has been developed for determination of trace levels of halide impurities in various types of ionic liquids (ILs). The advantage of this method is that all relevant halide species can be measured in a single chromatographic analysis. Separation of halides was performed on a Dionex AS9-HC column using an eluent consisting of 20 mM NaOH and 10% (v/v) acetonitrile, delivered at 1.5 mL min−1. Using this eluent, fluoride, chloride and bromide were well resolved from each other, but iodide was co-eluted with tetrafluoroborate (BF4−) present as a counter-anion in tetrafluoroborate-based ILs. The same eluent was also used successfully for the determination of halides in highly hydrophobic ILs, such as those based on bis-(trifluoromethanesulfonyl)imide (TFSI−) and bis-perfluoroethylsulfonylimide (BETI−). In this case, 50% (v/v) acetonitrile aqueous was needed to dissolve the sample before injection, and this did not adversely affect the separation. Detection limits in the measured solution were 0.1, 0.2 and 1.0 ppm for chloride, bromide and iodide, respectively, by conductivity detection, and 0.02 ppm for iodide by UV detection.

Item Type: Article
Keywords: Ion-chromatography - Halide impurity - Ionic liquid
Journal or Publication Title: Chromatographia
Page Range: pp. 495-498
ISSN: 0009-5893 (Print) 1612-1112 (Online)
Identification Number - DOI: 10.1365/s10337-008-0527-4
Additional Information: The original publication is available at www.springerlink.com
Date Deposited: 14 Mar 2008 02:03
Last Modified: 18 Nov 2014 03:31
URI: http://eprints.utas.edu.au/id/eprint/3469
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