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

Solvent ExtractionResidue (Chemistry)Sample Preparation MethodEngineeringPesticide-residue AnalysisEnvironmental EngineeringUltrasound-assisted Solvent ExtractionAnalytical ChemistryEcotoxicologySample Pre-treatmentOrganophosphorus Pesticides ResiduesChromatography