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Sequential extraction and enrichment of pesticide residues in Longan fruit by ultrasonic-assisted aqueous two-phase extraction linked to vortex-assisted dispersive liquid-liquid microextraction prior to high performance liquid chromatography analysis

Food ChemistrySolvent ExtractionResidue (Chemistry)Pesticide-residue AnalysisSequential ExtractionAnalytical ChemistryLiquid ChromatographyChromatographic AnalysisLongan FruitChromatographyPesticide Residues