Figure 2: Effect of ionic strength on the retention of sulfaquinoxaline sodium (Sulf) (20 g/ml), vitamin K3 (Vit K) (10 g/ml), and amprolium hydrochloride (Ampro) (20 g/ml). Mobile phase consisting of ACN and NH4AC solution (80:20; v/v) adjusted to pH of 5.0; flow rate=0.5 ml/min; ?=263 nm; the concentration of NH4AC is as shown in the figure.