Abstract:

Room-temperature ionic liquids were used as the stationary phases in gas chromatography, but many of them suffered from low thermal stability and possessed an unfavorable retention behavior for some classes of molecules. The Geminal dicationic ionic liquid(GDIL)was synthesized and it was mixed with FFAP in the mass ratio of 1∶2 to produce the stationary phase. The column efficiency was 3500 p/m after being conditioned at 220 ℃ and the average polarity was 435.2, significantly deceased compared to the FFAP column. Despite of this, the selectivity of the novel column for both polar aromatic positional isomers and weak polar ones was improved. In addition, it was found that this novel kind of stationary phase had unique selectivity for the mixtures of polycyclic aromatic hydrocarbons, the homologous series of alcohols, esters, carboxylic acids and alkanes.

Key words: Ionic liquid, Gas chromatography, Stationary phase