Citation: ZHANG Wenmin, FENG Zunmei, HUANG Chuanhui, GAO Jia, ZHANG Lan. In-situ solvothermal polymerization of metal-organic framework/carbon-nitrogen nanosheet-coated solid-phase microextraction fiber for highly sensitive detection of pesticide residues in black tea[J]. Chinese Journal of Chromatography, ;2020, 38(3): 332-340. doi: 10.3724/SP.J.1123.2019.10036 shu

In-situ solvothermal polymerization of metal-organic framework/carbon-nitrogen nanosheet-coated solid-phase microextraction fiber for highly sensitive detection of pesticide residues in black tea

1.
Minjiang Teachers College, Fuzhou 350109, China;
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Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fuzhou University, Fuzhou 350116, China

Corresponding author: ZHANG Lan, zlan@fzu.edu.cn
Received Date: 31 October 2019

Fund Project: Project of Collaborative Innovation Center of Chinese Oolong Tea Industry-Collaborative Innovation Center of Fujian Province (2011)

Pyrethroids (PYs) and organochlorine pesticides (OCPs) are widely used to control pests and diseases in plants; however, they threaten human health. In this study, a metal-organic framework/carbon-nitrogen nanosheet composite nanomaterial (UiO-66/HOCN)-coated solid-phase microextraction (SPME) fiber was prepared by in-situ thermal polymerization. The prepared UiO-66/HOCN composite material was characterized by transmission electron microscopy, X-ray diffraction, nitrogen adsorption porosimetry, thermogravimetric analysis, and zeta potentiometry. The prepared UiO-66/HOCN composite-coated MSPE fiber was used for the enrichment and separation of OCPs and PYs, which showed good thermal and chemical stability as well as high extraction efficiency. Combined with gas chromatography-mass spectrometry (GC-MS), an efficient and sensitive method for the detection of trace levels of OCPs and PYs was developed. Under the optimal experimental conditions, wide linear ranges (0.1-800.0 ng/L), good linearity (≥ 0.9978), low limits of detection (0.03-0.30 ng/L), and acceptable repeatability (RSD ≤ 8.9%, n=3) were obtained. Typical black tea samples were analyzed by the developed method, and trace levels of aldrin (6.6 ng/g), α -endosulfan (54.7 ng/g), and bifenthrin (185.8 ng/g) were detected. The results demonstrate that the developed method has immense potential for the detection of pesticides in a complicated matrix.
- porous carbon-nitrogen nanosheet,
- metal-organic framework (MOF),
- solid-phase microextraction (SPME),
- gas chromatography-mass spectrometry (GC-MS),
- pesticides,
- black tea
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沈阳化工大学材料科学与工程学院沈阳 110142