Determination of alkyl ammonium ionic liquid cations by hydrophilic interaction liquid chromatography and its application in analysis of environmental water

Analysis of alkyl ammonium ionic liquid cations in environmental water by the reversed phase ion-pair SPE combined with HILIC-IUV. (a) The chromatogram of alkyl ammonium cations; (b) the chromatogram of alkyl ammonium cations after enrichment.