四丁基铵离子液体阳离子的离子色谱-直接电导检测法分析

Analysis of tetrabutyl ammonium ionic liquid cation by ion chromatography-direct conductivity detector

采用离子色谱-直接电导检测的方法对四丁基铵阳离子进行了系统的研究,考察了色谱柱、淋洗液、色谱柱温度及流速对测定四丁基铵阳离子的影响,并讨论了保留规律。用羧酸型阳离子交换色谱柱,以3 mmol·L^-1甲烷磺酸-40%乙腈为淋洗液,流速1 m L·min^-1,色谱柱温度40℃,四丁基铵阳离子的保留时间小于4 min。本方法测定四丁基铵阳离子的检出限（S/N=3）为0.82 mg·L^-1,保留时间和峰面积的相对标准偏差（n=5）分别为0.09%和1.10%。方法用于测定实验室合成的四丁基铵离子液体样品,加标回收率为98%~100.1%。本方法准确、可靠、快速,具有较好的实用性,可满足离子液体样品的检测要求。

A systematic study of tetrabutyl ammonium ionic liquid cation using ion chromatography with conductivity detection had been conducted. The effects of the eluent type, eluent eoneentration, eluent pH value, column type, column temperature, and flow rate on the determination of tetrabutyl ammonium ionic liquid cation were investigated, and the retention rules were discussed. The optimal chromatographic conditions were 3 mmol· L^-1 methanesulfonie acid-40% acetonitrile as eluent, flow rate of 1.0 mL·min^-1 and column temperature of 40℃. Under the conditions, the retention time of tetrabutyl ammonium ionic liquid cation was less 4 min. The detection limit（ S/N= 3 ）of the method was 0. 82 mg· L^-1 , the relative standard deviations （n = 5 ）of retention time and peak area were 0. 09% and i. 10% , respectively. The recovery of spiked tetrabutyl ammonium ionic liquid cation was in the range of 98% -100. 1%. The method was proved to be accurate, reliable, rapid, and meet the requirements for quantitative analysis of tetrabutyl ammonium ionic liquid samples.