Rapid Determination of Trifluoromethanesulfonate and p -Toluenesulfonate by Ion-Pair Chromatography Using a Reversed-Phase Silica-Based Monolithic Column: Application to the Analysis of Ionic Liquids

摘要: A method of ion-pair chromatography was developed on a reversed-phase silica-based monolithic column for the fast and simultaneous determination trifluoromethanesulfonate (CF3SO3−) p-toluenesulfonate (C7H7SO3−). The analysis performed using mobile phase tetrabutylammonium hydroxide + citric acid acetonitrile Chromolith Speed ROD RP-18e with direct conductivity detection. effects eluent, temperature flow rate retention anions were investigated. experimental phenomenon discussed according to hydrophobic interaction ion-exchange mechanism in separation. optimized chromatographic conditions selected. eluent separation consisted 0.2 mmol L−1 0.10 9% (pH 5.5). set at 6.0 mL min−1. 25 °C. Under optimal conditions, better CF3SO3− C7H7SO3− achieved without any interference by other (Cl−, Br−, I−, NO3−, SO42−, ClO3−, BF4− PF6−). detection limit (S/N = 3) 0.28 0.71 mg C7H7SO3−, respectively. has been applied ionic liquids. spiked recoveries 101.1 100.2%,