紫外检测离子色谱法测定咪唑离子液体阳离子的研究  

Determination of imidazolium ionic liquid cations by ion chromatography with ultraviolet detection

作　　者：刘泽坤 张雪[1] 孙晓娇[1] 马亚杰[1] 于泓[1] LIU Zekun;ZHANG Xue;SUN Xiaojiao;MA Yajie;YU Hong(College of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China)

机构地区：[1]哈尔滨师范大学化学化工学院,黑龙江哈尔滨150025

出　　处：《化学研究与应用》2018年第6期881-886,共6页Chemical Research and Application

基　　金：黑龙江省自然科学基金项目(B201307)资助;哈尔滨师范大学创新团队和大学生实践创新基金项目资助

摘　　要：建立了用离子色谱-直接紫外检测法对咪唑离子液体阳离子进行分离测定的方法。以甲烷磺酸/乙腈为流动相,羧酸型阳离子交换剂为固定相,实现了咪唑阳离子的分离和直接紫外检测。结果表明,咪唑阳离子的保留是放热过程,其同系物保留符合碳数规律。在柱温45℃,流速1.0 mL·min^(-1),以5.0 mmol·L^(-1)甲烷磺酸/乙腈(91/9,v/v)为流动相的检测条件下,1-乙基-3-甲基咪唑阳离子、1-丙基-3-甲基咪唑阳离子、1-丁基-3-甲基咪唑阳离子、1-戊基-3-甲基咪唑阳离子和1-己基-3-甲基咪唑阳离子在33 min内达到基线分离。检出限是0.09~0.43 mg·L^(-1),相对标准偏差不高于1.5%。将以上这种方法应用于实验室合成的咪唑离子液体样品的分析,加标回收率可以达到97.0%~100.7%。本方法简单、灵敏,具有较好实用性。A method was established for the separation and detection of imidazolium ionic liquid cations by ion chromatography coupled with ultraviolet detection.The separation of imidazolium cations and direct ultraviolet detection were carried out by using methanesulfonic acid/acetonitrile as mobile phase and carboxylic acid cation exchanger as stationary phase.The results indicated that,the retention process of imidazolium cations was exothermic,the retention of imidazolium cation homologue was consistent with carbon number rules.The successful separation of 1-ethyl-3-methyl-imidazolium,1-propyl-3-methyl-imidazolium,1-butyl-3-methyl – imidazolium,1-amyl-3-methyl-imidazolium and 1-hexyl-3-methyl-imidazolium cations within 33 min was achieved under the conditions of the column temperature 45℃,at a flow rate of 1. 0 mL·min^（-1）,using 5. 0 mmol·L^（-1） methanesulfonic acid/acetonitrile（ 91/9,v/v）as mobile phase.The detection limits of the cations were 0. 09 - 0. 43 mg·L^（-1）.The relative standard deviations were less than 1. 5%. The method has been applied to the determination of imidazolium ionic liquid samples synthesized in chemical laboratory with the spiked recovery rates between 97. 0% and 100. 7%. The method is simple,sensitive,and has better practicability.

关 键 词：离子色谱 紫外检测 离子液体 咪唑阳离子 甲烷磺酸 

分 类 号：O657.75[理学—分析化学]