These Cation Chromatography Application Notes look at column selectivity, water and wastewater samples:
AN-CS-006: Aliphatic amines and ethanol amines in addition to standard cations by
sequential suppression
AN-CS-007: Lithium in addition to other cations in seepage water from minerals through sequential suppression
AN-CS-009: Leaching tests for sample vials in cation trace analysis with sequential
suppression
AN-CS-010: Traces of lithium and sodium besides monoethanolamine in water-steam
circuits of thermal power plants