Abstract
A new in-tube pretreatment method based on ultrasound assisted dispersive solid–liquid microextraction using self-assembly and solidification of an alkanol-based floating organic droplet was developed for the determination of eight pyrethroid insecticides in chrysanthemum by gas chromatography with electron capture detection. This method fully utilized the restricted access property of a 1-decanol/acetonitrile mixture for effective extraction of the analytes from chrysanthemum under ultrasonication, and the self-assembly and coacervation process of 1-decanol by adding water. The 1-decanol phase aggregated and floated on the surface, solidified in an ice bath, and thus was easily collected. For the first time, extraction, separation and preconcentration were combined in a tube, not requiring stepwise preparation for a solid matrix. The recoveries ranged from 75 to 104% with the relative standard deviations of < 8%. The limits of quantification were in the range of 0.15–1.5 µg kg− 1 up to 52-fold compared with the conventional QuEChERS-based, SPE, and solid–liquid dispersive microextraction methods. The results demonstrated that the proposed method was time-saving, sensitive, and environmentally friendly for pyrethroids analysis in chrysanthemum.
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Acknowledgements
This work was partly supported by the National Key Research and Development Program of China (2016YFD0200201), the National Natural Science Foundation of China (41807490), the Natural Science Research Project of High Education of Anhui (KJ2018A0128), and the University Youth Science Foundation of Anhui Agricultural University (2017zd04).
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Author Jiaying Xue declares that she has no conflict of interest. Author Dong Zhang declares that he has no conflict of interest. Author Xiangwei Wu declares that he has no conflict of interest. Author Dandan Pan declares that she has no conflict of interest. Author Rimao Hua declares that he has no conflict of interest.
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Xue, J., Zhang, D., Wu, X. et al. In-Tube Ultrasound Assisted Dispersive Solid–Liquid Microextraction Based on Self-Assembly and Solidification of an Alkanol-Based Floating Organic Droplet for Determination of Pyrethroid Insecticides in Chrysanthemum. Chromatographia 82, 695–704 (2019). https://doi.org/10.1007/s10337-018-3678-y
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DOI: https://doi.org/10.1007/s10337-018-3678-y