Separation of four inorganic anions using Shodex IC SI-50 4E column

Ion chromatography of anions on a Shodex IC SI-50 4E column (250×4 mm) using an eluent containing 1.0 mM NaHCO₃ and 3.2 mM Na₂CO₃ in water pumped at 0.7 mL/min at 24 °C. Background reduced to ~17 µS/cm by XAMS suppressor with ASUREX-A100 automatic regenerator. Eluent pumping and conductivity detection by Metrohm 761 Compact IC. Injection of 20 µL of F¯, Cl¯ (2 mg/L), NO₂¯ (5 mg/L), Br¯ (10 mg/L) in water.