Facile synthesis of a core-shell structured magnetic covalent organic framework for enrichment of organophosphorus pesticides in fruits
文献类型： 外文期刊
作者： Lin, Xiangping 1 ; Wang, Xinquan 2 ; Wang, Jiao 2 ; Yuan, Yuwei 2 ; Di, Shanshan 2 ; Wang, Zhiwei 2 ; Xu, Hao 2 ; Zhao, H 1 ;
作者机构： 1.Northeast Agr Univ, Coll Agr, Harbin 150030, Peoples R China
2.Zhejiang Acad Agr Sci, Inst Qual & Stand Agroprod, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China
3.Key Lab Detect Pesticide Residues & Control Zheji, Hangzhou 310021, Peoples R China
4.Agr Minist Key Lab Pesticide Residue Detect, Hangzhou 310021, Peoples R China
关键词： Magnetic covalent organic framework; Magnetic solid-phase extraction; Organophosphorus pesticides; Fruits
期刊名称：ANALYTICA CHIMICA ACTA （ 影响因子：6.558； 五年影响因子：6.228 ）
ISSN： 0003-2670
年卷期： 2020 年 1101 卷
页码：
收录情况： SCI
摘要： A facile strategy was developed for the fabrication of a magnetic covalent organic framework (COF) via grafting of the monomers, 2,5-dihydroxyterephthalaldehyde (Dt) and 1,3,5-tris(4-aminophenyl) benzene (Tb) onto surface-modified Fe3O4 nanoparticles. The magnetic COF, named as magnetic COF-DtTb, was readily fabricated without high temperature or harsh reaction conditions. The synthesized magnetic COF-DtTb nanoparticles were fully characterized, presenting a regular core-shell spherical structure, large specific surface area, superparamagnetism, and good thermal stability. Their potential as an enrichment adsorbent was investigated to establish an efficient magnetic solid-phase extraction method for the determination of organophosphorus pesticide residues in fruits. Systematic method validation revealed good linearity in the concentration range of 1-200 mu g L-1 (correlation coefficient >0.9957). The method limits of detection were in the range of 0.002-0.063 mu g kg(-1), the method limit of quantification was 1.00 mu g kg(-1) and recoveries ranged from 72.8% to 111% with RSDs lower than 12.3%. The results indicated that magnetic COF-DtTb possesses superior trace enrichment properties for organophosphorus pesticides in fruits. (C) 2019 Elsevier B.V. All rights reserved.
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