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A novel magnetic multi-walled carbon nanotubes-based magnetic solid-phase extraction combined with dispersive liquid-liquid microextraction method for determination of four phenoxy carboxylic acid herbicides in food crops by using ultra-high performance liquid chromatography-tandem mass spectrometry

Abstract

A simple, rapid and sensitive method for determination of four phenoxy carboxylic acid herbicides (4-chlorophenoxy acetic acid, 2-methyl-4-chlorophenoxy acetic acid, 2,4-dichlorophenoxy acetic acid and 2-(2,4-dichlorophenoxy) propionic acid) in food crops was established by magnetic multi-walled carbon nanotubes assisted magnetic solid-phase extraction combined with dispersive liquid-liquid microextraction followed by ultra-high performance liquid chromatography-tandem mass spectrometry. In our current study, magnetic multi-walled carbon nanotubes were successfully synthesized and characterized by using Fourier transform infrared spectrometry, X-ray diffraction, scanning electron microscopy and vibrating sample magnetometry. The food crops were firstly pretreated with magnetic solid-phase extraction and the extracts were further purified by dispersive liquid-liquid microextraction. Various extraction factors were systematically optimized. Under the optimum conditions, satisfactory sensitivity levels were obtained with the method detection limits of 0.19-0.80 ng g-1 and method quantitation limits of 0.61-2.66 ng g-1. The recoveries of the four herbicides in different food crops ranged from 83.9 to 102.7% and the precision of developed method was no more than 10.9%. Furthermore, the method was successfully applied to determine the four phenoxy carboxylic acid herbicides in the real food crops (rice, millet, soy, oatmeal, and barley) with satisfactory results.

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Publication details

The article was received on 27 Mar 2018, accepted on 30 May 2018 and first published on 05 Jun 2018


Article type: Paper
DOI: 10.1039/C8AY00684A
Citation: Anal. Methods, 2018, Accepted Manuscript
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    A novel magnetic multi-walled carbon nanotubes-based magnetic solid-phase extraction combined with dispersive liquid-liquid microextraction method for determination of four phenoxy carboxylic acid herbicides in food crops by using ultra-high performance liquid chromatography-tandem mass spectrometry

    X. Yuan, C. Liu, J. Zhao, P. Zhao and L. Zhao, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY00684A

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