Journal
JOURNAL OF SEPARATION SCIENCE
Volume 40, Issue 2, Pages 442-448Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201600787
Keywords
benzoylurea insecticides; ionic liquids; magnetic nanoparticles; microextraction
Categories
Funding
- Beijing Youth Fellowship Program [YETP0325]
- National Natural Science of Foundation of China [21277172, 21377163]
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A simple, fast, effective, and environmentally friendly method, in situ solvent formation microextraction combined with magnetic dispersive micro-solid-phase extraction for the determination of four benzoylurea insecticides is presented herein for the first time. In the proposed method, 1-hexyl-3-methylimidazolium bis[(trifluoromethane)sulfonyl]imide was formed by the reaction between 1-hexyl-3-methylimidazolium chloride and lithium bis[(trifluoromethane)sulfonyl]imide and was used to extract benzoylurea insecticides. Then magnetic nanoparticles were added as carrier to retrieve and separate the ionic liquid from the sample solution. After the supernatant was removed, the ionic liquid was desorbed using acetonitrile and subsequently injected directly into a high-performance liquid chromatograph equipped with a variable wavelength detector for analysis. The main factors affecting the extraction efficiency were investigated by a one factor at a time approach. Under optimized conditions, the proposed method showed good repeatability (RSD = 2.2-4.5%) and linearity (2-300 g/L), with correlation coefficients greater than 0.9994 and low limits of detection (0.67-1.46 g/L). Finally, the method was successfully applied to the analysis of four benzoylurea insecticides in environmental water samples with good recoveries (73.2-85.8%).
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