Hydroxide-selective, anion-exchange columns are optimized for use with a hydroxide eluent. Choose a hydroxide eluent column for use with an eluent generator for gradient work or trace analysis. Hydroxide eluents for isocratic or gradient elution are very convenient with Reagent-Free^TM Ion Chromatography (RFIC^TM) technology using electrolytic generation of the eluent. RFIC technology simplifies methods development for hydroxide-gradient systems since the electrolytic eluent generator provides gradient methods that are simpler to use than manually prepared isocratic eluents. Modern continuous-eluent-suppression systems are designed to suppress hydroxide eluents, even at very high eluting strengths.

Each of these anion-exchange columns are optimized for use with a carbonate/bicarbonate eluent. Carbonate eluent columns are useful for well-characterized isocratic separations, including regulated methods for drinking and wastewater.

Specialty columns are anion-exchange columns that can be used with nonsuppressible eluents such as nitric acid in combination with a variety of detection modes, including amperometric and UV-VIS detection.

Cation-exchange columns are designed for high-resolution separations of inorganic cations, ammonium, amines, and transition metals. These columns provide an excellent approach to separations of alkylamines, alkanolamines, and quaternary ammonium ions.

Transition metal columns are designed for determination of transition and lanthanide metals in diverse sample matrices.

In ion-exclusion separations, Donnan exclusion causes strong acids to elute in the void volume of the column. Weak acids that are protonated in the acidic eluent are not subject to Donnan exclusion and penetrate into the pores of the packing. Separation is accomplished by differences in pK_a, size, and hydrophobicity.

Trap columns are short columns installed in the system to prevent unwanted analytes from interfering with the separation of your analytes of interest.  IonPac trap columns contain high-capacity, low-efficiency, ion-exchange resin.  The columns strip trace contaminants from the eluent and prevent them from reaching the guard and analytical columns.  The trap is installed in the eluent line prior to the injection valve to prevent spurious peaks during gradient chromatography.  These trap columns are specialized columns that remove unwanted analytes from the sample, and are installed before the analytical column.

IonPac concentrator columns are designed primarily for high purity water analysis.  The concentrator column strips ions from a measured volume of an aqueous sample matrix, concentrating the analyte species and lowering detection limits.