[Simultaneous determination of hexafluorophosphate and other trace impurity anions in ionic liquids by ion chromatography].
A method was developed for the simultaneous determination of hexafluorophosphate and other trace impurity anions in ionic liquids by ion chromatography (IC). The sample was diluted with 70% (v/v) acetonitrile, filtrated by 0.22 microm nylon filter membrane, and then analyzed by IC. The analytical column was Dionex IonPac AS22 (250 mm x 4 mm), carbonate-acetonitrile (70:30, v/v) was used as the eluent at a flow rate of 1.0 mL/min. The detection was performed by a Dionex DS6 conductivity detector. The quantitive analysis of external standard calibration curves was used. The linear ranges of the method for F(-), Cl(-), Br(-) and PF6(-) were 0.5 - 50 microg/L (r = 0.9999), 10 - 200 microg/L (r = 0.9998), 10 - 200 microg/L (r = 0.9999) and 0.9 - 45 mg/L (r = 0.9998), respectively. The average recoveries were 94.5% - 100.5% with the relative standard deviations of 0.63% - 1.03%. The detection limits (S/N = 3) were 0.5 microg/L, 2.0 microg/L, 5.0 microg/L and 0.9 mg/L for F(-), Cl(-), Br(-) and PF6(-), respectively. The method has been applied to determine hexafluorophosphate and other trace impurity anions in ionic liquids with satisfactory results.
Shanghai Laboratory of Application and Research Center, Dionex China Limited, Shanghai 201203, China. huzy82@126.com
Zhongyang
Z
Hu
Guangwen
G
Pan
Mingli
M
Ye