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J Chromatogr A. 2013 Jan 4;1271(1):170-5. doi: 10.1016/j.chroma.2012.10.052. Epub 2012 Nov 2.

Gas chromatographic retention of alkyl phosphates on ionic liquid stationary phases.

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Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6C 2X4.


Retention behaviors of alkyl phosophates were studied on a series of ionic liquid gas chromatography columns. The selectivity of the IL columns for alkyl phosphates were compared with a 5% phenyl column as a route to evaluating the potential use of IL columns in the analysis of alkyl phosphates in petroleum samples in both one- and multi-dimensional GC. Most interestingly, we demonstrate for the first time the dependence of elution order on separation temperature for members of a homologous series of compounds. At low temperatures it was found that trihexyl phosphate eluted before trioctyl phosphate, while at higher temperatures this pattern was reversed.

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