期刊
ANALYTICA CHIMICA ACTA
卷 1101, 期 -, 页码 65-73出版社
ELSEVIER
DOI: 10.1016/j.aca.2019.12.012
关键词
Magnetic covalent organic framework; Magnetic solid-phase extraction; Organophosphorus pesticides; Fruits
资金
- National Key Research and Development Programme of China [2017YFC1601600]
- State Key Laboratory for Quality and Safety of Agro-products [2010DS700124-KF1905]
- National Natural Science Foundation of China [31501556, 21607133]
- Agriculture Research System of China [CARS-29]
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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