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Determination of octylphenol and nonylphenol in aqueous sample using simultaneous derivatization and dispersive liquid–liquid microextraction followed by gas chromatography–mass spectrometry

Gas Chromatography–mass SpectrometrySimultaneous DerivatizationEngineeringSeparation ScienceGas ChromatographyMedicineMass SpectrometryOrganic ChemistryAnalytical ChemistryLiquid ChromatographyChromatographic AnalysisPharmacologyDispersive Liquid–liquid MicroextractionChromatographyDrug Analysis