Fig. 2From: Simultaneous determination of 31 Sulfonamide residues in various livestock matrices using liquid chromatography-tandem mass spectrometryComparison of extraction solvents and salt combination in pork samples at 0.1 μg kg−1. (1) ACN/NaCl 1 g, (2) ACN/NaCl 1 g, MgSO4 2 g, (3) ACN/NaOAc 1 g, MgSO4 2 g, (4) 0.1% acetic acid in ACN/NaCl 1 g, MgSO4 2 g, (5) 1% acetic acid in ACN/NaCl 1 g, Na2SO4 2 g, (6) 1% acetic acid in ACN/NaOAc 1 g, Na2SO4 2 gBack to article page