以吡啶离子液体作为流动相添加剂的液相色谱法分析三氟乙酸根与三氟甲磺酸根  

Analysis of Trifluoroacetate and Trifluoromethanesulfonate by Liquid Chromatography with Pyridinium Ionic Liquids as Mobile Phase Additives

作　　者：崔歌 于泓[1] 张亚楠 CUI Ge;YU Hong;ZHANG Ya-nan(College of Chemistry and Chemical Engineering,Harbin Normal University,Heilongjiang Province Key Laboratory of Photochemical Biomaterials and Energy Storage Materials,Harbin 150025,China)

机构地区：[1]黑龙江省光化学生物材料与储能材料重点实验室,哈尔滨师范大学化学化工学院,黑龙江哈尔滨150025

出　　处：《分析测试学报》2018年第8期925-929,共5页Journal of Instrumental Analysis

基　　金：黑龙江省自然科学基金项目(B201307)；哈尔滨师范大学创新团队资助项目

摘　　要：发展了用吡啶离子液体作为流动相添加剂的反相液相色谱分离和间接紫外检测三氟乙酸根和三氟甲磺酸根的分析方法。研究了吡啶离子液体、咪唑离子液体、对氨基苯酚盐酸盐和氯化四丁基铵作为流动相添加剂对三氟乙酸根和三氟甲磺酸根的影响,考察了吡啶离子液体的浓度、有机溶剂和检测波长等因素,并讨论了离子液体的作用、保留规律和相关机理。吡啶离子液体在分离检测中起到离子对试剂和紫外吸收试剂的作用。采用反相C_(18)色谱柱,以甲醇-0.3 mmol/L溴化N-己基吡啶水溶液(体积比10∶90)为流动相,在柱温30℃,流速1.0 m L/min,紫外检测波长250 nm条件下,三氟乙酸根和三氟甲磺酸根在12 min内完全分离,检出限分别为0.09、0.18 mg/L。将此法应用于离子液体中三氟乙酸根和三氟甲磺酸根阴离子的测定,加标回收率为96.0%~101%。该方法简单、准确,具有实用价值。An analytical method was developed for the simultaneous determination of trifluoroacetate and trifluoromethanesulfonate by reversed-phase liquid chromatography with indirect ultraviolet detection using pyridinium ionic liquids as mobile phase additives.The chromatographic behaviors of the two anions on the C 18 column were studied and compared with four types of reagents including pyridinium ionic liquid,imidazolium ionic liquid,4-aminophenol hydrochloride and tetrabutylammonium chloride as mobile phase additives.Effects of concentrations of pyridinium ionic liquids,organic solvents and detection wavelength on separation and detection of the anions were investigated.The role of ionic liquids,retention rules and relevant mechanisms were discussed.Pyridinium ionic liquids acted as ion pair reagent and ultraviolet absorption reagent in separation and detection of the anions.The separation of the anions was performed on a C 18 reserved-phase column using methanol-0.3 mmol/L N-hexylpyridine bromide(10∶90,by volume)as mobile phase at a column temperature of 30℃,a flow rate of 1.0 mL/min and a detection wavelength of 250 nm.Under these conditions,two anions were completely separated in 12 min.The detection limits were 0.09 mg/L and 0.18 mg/L,respectively.The method was applied in the determination of trifluoroacetate and trifluoromethanesulfonate in ionic liquid samples with spiked recoveries of 96.0%-101%.The method is simple,accurate and practical.

关 键 词：离子液体 液相色谱 间接紫外检测 三氟乙酸根 三氟甲磺酸根 

分 类 号：O657.72[理学—分析化学] TQ423.11[理学—化学]