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IC Determination of Halide Impurities in Ionic Liquids


Hao, F and Haddad, PR and Ruther, T, IC Determination of Halide Impurities in Ionic Liquids, Chromatographia, 67, (5/6) pp. 495-498. ISSN 0009-5893 (2008) [Refereed Article]

DOI: doi:10.1365/s10337-008-0527-4


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 (BF 4 - ) 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. © 2008 Friedr. Vieweg & Sohn Verlag/GWV Fachverlage GmbH.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Haddad, PR (Professor Paul Haddad)
ID Code:55173
Year Published:2008
Web of Science® Times Cited:47
Deposited By:Chemistry
Deposited On:2009-03-05
Last Modified:2009-05-01

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