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Simultaneous determination of phenyl- and sulfonyl-urea herbicides in river water at sub-parts-per-billion level by on-line preconcentration and liquid chromatography–tandem mass spectrometry

Sulfonyl-urea HerbicidesRiver WaterEngineeringPesticide-residue AnalysisSub-parts-per-billion LevelEnvironmental ChemistryEnvironmental Analytical ChemistryAnalytical ChemistryLiquid ChromatographyChromatographyWater QualityEcotoxicologyChemical PollutionWater AnalysisEnvironmental EngineeringMass SpectrometryEnvironmental ToxicologyMedicineDrug Analysis