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Issue 14, 2015
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Determination of ionic liquid cations in soil samples by ultrasound-assisted solid-phase extraction coupled with liquid chromatography-tandem mass spectrometry

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Abstract

Liquid chromatography-tandem mass spectrometry coupled with an ultrasonic-assisted extraction and solid phase extraction procedure has been investigated for the separation and detection of imidazolium, pyridinium, pyrrolidinium, ammonium and phosphonium-based ionic liquid (IL) cations in soil samples. First, the samples were extracted with acetonitrile–0.2 mol L−1 ammonium chloride solution (8 : 2, v/v; pH 3) using an ultrasonic assisted extraction procedure and then eluted on a Strata-X-CW solid-phase extraction column. The target compounds were effectively separated with an Agilent SB-C18 (1.88 μm, 3.0 mm × 100 mm) chromatographic column by gradient elution, in which acetonitrile–water (containing 0.1% formic acid) acted as the mobile phase. The IL cations were determined by electrospray positive ionization (ESI+) combined with multiple reaction monitoring (MRM) mode, and quantified by the matrix-matched external standard method. The limits of detection (LODs) ranged from 0.15 to 2.88 ng g−1 and the limits of quantification (LOQs) from 0.50 to 9.50 ng g−1. The average recoveries of the twenty-three IL cations in soil samples were in the range of 69.3–106.8%, with relative standard deviations of 2.17–12.1%. This assay showed greater sensitivity and accuracy, to meet the requirements of the determination of IL cations in soil.

Graphical abstract: Determination of ionic liquid cations in soil samples by ultrasound-assisted solid-phase extraction coupled with liquid chromatography-tandem mass spectrometry

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Publication details

The article was received on 20 Mar 2015, accepted on 02 Jun 2015 and first published on 03 Jun 2015


Article type: Paper
DOI: 10.1039/C5AY00750J
Anal. Methods, 2015,7, 5924-5933

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    Determination of ionic liquid cations in soil samples by ultrasound-assisted solid-phase extraction coupled with liquid chromatography-tandem mass spectrometry

    C. Lu, Z. Tang, C. Liu, X. Chen, Y. Wang and F. Dang, Anal. Methods, 2015, 7, 5924
    DOI: 10.1039/C5AY00750J

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