Technical Note 117. In this study, inorganic cations in influent and effluent municipal wastewater samples are separated in 3.5 min by cation-exchange chromatography using a Thermo Scientific™ Dionex™ IonPac™ CS12A-5µm column, using an electrolytically generated eluent flowing at 0.75 mL/min and suppressed conductivity detection.