Sample preparation method for the analysis of some organophosphorus pesticides residues in tomato by ultrasound-assisted solvent extraction followed by dispersive liquid-liquid microextraction

► Simple, inexpensive and rapid procedure for extraction and determination of OPPs in tomato is proposed. ► Sonication LLE combined dispersive liquid-liquid microextraction were used as sample preparation method. ► No clean-up or evaporation were required after extraction. ► Some organophosphorus pesticides residues were monitored in tomato samples. ► GC-FPD was hired for monitoring of pesticides residue in tomato extract.