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Liquid chromatography–electrospray ionization isotope dilution mass spectrometry analysis of paraquat and diquat using conventional and multilayer solid-phase extraction cartridges

Gas ChromatographyMedicineEnvironmental Analytical ChemistryMass SpectrometryAnalytical ChemistryLiquid ChromatographyChemistryChromatographic AnalysisPharmacologyChromatographyDrug Analysis