Fig. 3From: Simultaneous determination of 31 Sulfonamide residues in various livestock matrices using liquid chromatography-tandem mass spectrometryComparison of cleanup in pork samples at 0.1 μg kg−1. (1) C18 500 mg, (2) C18 300 mg PSA 300 mg, (3) C18 300 mg PSA 150 mg, and (4) C18 150 mg PSA 150 mgBack to article page