4.7 Article

Extraction and detection of quaternary ammonium ionic liquid cations in water samples

期刊

ENVIRONMENTAL CHEMISTRY LETTERS
卷 19, 期 2, 页码 1839-1845

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s10311-020-01163-x

关键词

Environmental water; Ion chromatography; Ionic liquids; Quaternary ammonium cations; Solid-phase extraction

资金

  1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences [KF2017-21]

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This study established a method combining ion chromatography and solid-phase extraction to analyze quaternary ammonium ionic liquid cations in river water samples. The method achieved a detection limit of 0.003 mg/L, meeting the requirements for quantitative analysis.
The recent development of ionic liquids may induce environmental pollution, yet there is a lack of sensitive analytical methods to detect traces of ionic liquids, notably for quaternary ammonium ionic liquids. Here, we set up a method based on solid-phase extraction and ion chromatography combined to analyze quaternary ammonium ionic liquid cations in river water samples. Cations included tetramethylammonium, tetraethylammonium, tetrapropylammonium and tetrabutylammonium. We used methanesulfonic acid-acetonitrile as mobile phase in a cation-exchange column with carboxylic acid functional groups. A strong acid cation-exchange solid-phase extraction column was used for extraction and enrichment, then water-methanol was eluted to wash impurities, and finally the analytes were eluted with H3PO4-KH2PO4 buffer solution because this buffer has a low conductivity signal which avoids interferences with cation detection. We obtained a detection limit of 0.003 mg/L for river samples. Precision and accuracy met the requirements of quantitative analysis.

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