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Recoveries of different elution volumes using different solvents for residual analytes. (A) Anticonvulsants and β-blockers (atenolol (ANL), propranolol hydrochloride (PPNL) and carbamazepine (CBZ)), (B) parabens (methylparaben (MP), ethylparaben (EP), propylparaben (PP) and butylparaben (BP)), (C,D) fluoroquinolones (danofloxacin (DANO), enrofloxacin (ENRO), levofloxacin (LEVO)).
