▎ 摘　　要

In this study, an efficient magnetic sorbent was prepared to extract some pesticides including chlorpyrifos, haloxyfop-R-methyl, oxadiazon, diniconazole, clodinafop-propargyl, fenpropathrin, and fenoxprop-P-ethyl. Magnetic Fe3O4 nanoparticles were coated with graphene as a sorbent for the extraction of the target compounds in some fruit juices. The synthesized sorbent was characterized by vibrating sample magnetometery, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer-Emmett-Teller nitrogen sorption, Fourier transform infrared spectroscopy, and X-ray diffraction. First, the studied pesticides were adsorbed on the sorbent from a solution containing dissolved Na2SO4. In the following, the analytes were desorbed from the sorbent by 2-propanol. Then, the eluent containing analytes was separated from the sorbent, mixed with 1,1,2-trichloroethane (at mu L level), and injected into a solution containing dissolved NaCl. After centrifuging the formed cloudy solution, an aliquot of the sedimented phase was injected into a gas chromatograph equipped with mass spectrometer. The method has satisfactory extraction recoveries (42-76%), high enrichment factors (155-362), and good linearities of the calibration curves (r(2) >= 0.992). Limits of detection and quantification were in the ranges of 0.04-0.06 and 0.13-0.19 ng mL(-1), respectively. The proposed method was applied in the analysis of the selected pesticides in different fruit juices and fenpropathrin was found in mango juice at 17 +/- 0.1 ng mL(-1) level concentration.