Development of a SPE/GC–MS method for the determination of organophosphorus pesticides in food samples using syringe filters packed by GNP/MIL-101(Cr) nanocomposite

•A GNP/MIL-101(Cr) nanocomposite was synthesized as an efficient adsorbent for SPE.•The use of syringe filter reduced solvent consumption and enhanced the sensitivity.•The adsorbent showed very good extraction performance towards the selected OPPs.•Various OPPs were determined in water, juices, honey, tomato and cucumber samples at very trace levels. In this study, we report the synthesis and application of a nanocomposite comprising metal–organic framework MIL-101(Cr) and graphene nanopowder (GNP) as a promising sorbent for the extraction of organophosphorus pesticides (OPPs) in juices, water, vegetables and honey samples. A syringe filter, for the first time, was used to host the synthesized nanocomposite and extract the OPPs followed by GC–MS analysis. Different characterization methods including XRD, FTIR, TGA, BET and SEM were employed to confirm the formation of studied nanocomposite. The results indicated that the GNP/MIL-101(Cr) could provide higher capacity for adsorption of OPPs and lower detection limit compared to pristine MIL-101(Cr). The detection limits were 0.005 to 15.0 µg/Kg and the linear range found between 0.05 and 400 µg/Kg. The proposed method showed very good repeatability with the RSD values ranging from 2.9% to 7.1%. The recoveries were between 84% −110% with the spiked levels of 2.0–100.0 µg/Kg.