Separation of six inorganic anions using Shodex IC SI-37 4D column

Ion chromatography of anions on a Shodex IC SI-37 4D column (150×4 mm) using an eluent containing 23 mM KOH in water pumped at 0.5 mL/min at 25 °C, continuously mixed online from two different EQAX-B1 eluent bottles (1 L), containing either ultrapure water or 0.1 M KOH eluent concentrate, both protected with EQAX-TC1 trap cartridges for carbon dioxide removal. Background reduced by XAMS suppressor with ASUREX-A200 automatic regenerator. Eluent pumping and conductivity detection by (Thermo) Dionex DX-600 system with modules GS50, CD25, and LC30, connected to a Spark Holland Triathlon 900 autosampler. Injection of 20 µL of F¯ (1.5 mg/L), Cl¯ (3 mg/L), NO₂¯ (6 mg/L), Br¯, NO₃¯, SO₄²¯ (10 mg/L) in water.