Ionic liquids as mobile phase additives for high-performance liquid chromatography separation of phenoxy acid herbicides and phenols

被引：28
作者：
Hu, Xialin [1 ,2 ]
Peng, Jinfeng [3 ]
Huan, Yuanjian [1 ]
Yin, Daqiang [2 ]
Liu, Jingfu [1 ]
机构：
[1] Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
[2] Tongji Univ, State Key Lab Pollut Control & Resources Reuse, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China
[3] Ningbo Entry Exit Inspect & Quarantine Bur, Ningbo, Zhejiang, Peoples R China
来源：
JOURNAL OF SEPARATION SCIENCE | 2009年 / 32卷 / 23-24期
关键词：
High performance liquid chromatography; Ionic liquids; Ion-pair reagent; Phenoxy acid herbicides; Phenols; EXTRACTION; RETENTION; PH; MICROEXTRACTION; MECHANISM;
D O I：
10.1002/jssc.200900538
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In this present study, 1-butyl-3-methylimidazolium chloride ([C4MIM]Cl), I-octyl-3-methylimidazolium chloride ([C8MIM]Cl), and 1-decyl-3-methylimidazolium chloride ([(CMIM)-M-10)Cl) were adopted as mobile phase additives in the high performance liquid chromatography (HPLC) to simultaneously separate phenoxy acid herbicides and phenols at neutral pH. It was found that by using 20 mM of [C4MIM]Cl, baseline separation and good chromatograms for all the acid compounds were obtained on a normal reversed-phase C-18 column. The retention time of the target acid compounds shortened with the increase of the alkyl chain length and the concentrations of ionic liquids, probably due to the delocalization of the positive charge on the imidazolium cation, the repulsion between chlorine ions of ionic liquids and the acid compounds, as well as the stereo-hindrance effect. The mechanism with ionic liquids as mobile additives for the separation of acid compounds was discussed.
引用
收藏
页码：4126 / 4132
页数：7
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