Fig. 2From: Removal and tracing of cephalosporins in industrial wastewater by SPE-HPLC: optimization of adsorption kinetics on mesoporous silica nanoparticlesChromatogram of separation of cefadroxil, cefprozil, and cefradine using acidified water (pH 2.5) to methanol to acetonitrile (82:12:6, v/v), with acid as a mobile phase and cephalexin as the internal standardBack to article page