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A research of the performance of five imidazolium-based ionic liquids (ILs) (the bromides, tetrafluoroborates and hexafluorophosphates of 1-butyl, 1-hexyl and 1-octyl-3- methylimidazolium) as additives in ion exchange chromatographic (IEC) behavior of inorganic anion (NO3-) was studied. The results showed that the IL 1-butyl-3- methyl-imidazolium hexafluorophosphate (BMIMPF6) offered the most interesting feature in separation of inorganic anions, such as lower retention time and great peak height. In order to separate anions effectively, the best condition was selected that is to add 0.30 mM BMIMPF6 in IEC mobile phase for desperation of nitrate with the flow rate of 0.7 mL·min-1 at room temperature. In the range of 1.0~60 μg·mL-1, linear equations of nitrate was made. The limit of detection of nitrate was 4.4 μg·L-1. In this work, nitrate in water samples were detected successfully.

Usage of Ionic Liquids as Additives in Ion Exchange Chromatography for the Analysis of Inorganic Anions