Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (8): 995-1006.DOI: 10.19894/j.issn.1000-0518.200324

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Preparation of Ferroferric Oxide Loaded Graphitized Carbon Black Magnetic Nanomaterials and Application in Detection of Pesticide Residues in Tea

XUE Xiao-Kang1,2, FU Hong1, CHEN Li-Juan2, LI Jie2, YANG Fang2*   

  1. 1College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China
    2Fuzhou Customs Technical Center, Fuzhou 350001, China
  • Received:2020-10-29 Revised:2021-02-24 Published:2021-08-01 Online:2021-10-01
  • Supported by:
    National Key Research and Development Project (No.2017YFF0211304) and Fujian Natural Fund Project (No.2020J1098)

Abstract: A homogeneous ferroferric oxide loaded graphitized carbon black (GCB) magnetic nanomaterials was prepared based on a physical blending method. A method for the simultaneous determination of 405 pesticide residues in tea was established by using GCB/Fe3O4 as a solid-phase extraction (SPE) adsorbent and using phenol-calcium coprecipitation, magnetic SPE, and gas chromatography/triple quadrupole tandem mass spectrometry (GC-MS/MS). The crystal structure, surface morphology and adsorptive capacity of GCB/Fe3O4 were studied. The results show that the prepared materials are uniform, and the saturated adsorption capacities of catechin, curcumin and copper sodium chlorophyllin are 8.89 mg/g, 9.38 mg/g, and 3.68 mg/g, respectively. Compared with GCB, the adsorption capacity of curcumin and copper sodium chlorophyllin is increased by 5%~87%, and catechins in tea that cannot be adsorbed by GCB are also absorbed. The material is used to detect 405 pesticide residues in tea, the average recovery rate is 48.2%~123.6%, and the relative standard deviation is 0.4%~14.5%. Among them, the recovery rate of 377 pesticides is 70%~120%, accounting for 93.1%. The results show that the material has a good purification effect and is suitable for the detection of recovery rate of many kinds of pesticides.

Key words: Ferroferric oxide loaded graphitized carbon black, High pigment, Tea, Multi-pesticides residue, High throughput analysis

CLC Number: