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Simultaneous solid-phase extraction of acidic, neutral and basic pharmaceuticals from aqueous samples at ambient (neutral) pH and their determination by gas chromatography–mass spectrometry

Gas Chromatography–mass SpectrometrySolvent ExtractionSeparation ScienceGas ChromatographyMedicineMass SpectrometryBasic PharmaceuticalsAnalytical ChemistryChemistryChromatographic AnalysisPharmacologySimultaneous Solid-phase ExtractionChromatographyDrug Analysis