Fig. 4From: Simultaneous determination of 31 Sulfonamide residues in various livestock matrices using liquid chromatography-tandem mass spectrometryLC–ESI–MS/MS chromatograms of a sulfadimethoxine-positive chicken sample. a Blank chicken sample, b reagent standard chromatogram at MRL, c matrix-matched standard chromatogram at MRL, and d positive chicken sampleBack to article page