Ion chromatography systems with flow-delay eluent recycle

A chromatography apparatus comprising:

• (a) an electro elution separator including a chromatographic separation medium disposed in a column lumen, and first and second spaced electrodes in electrical communication with the chromatographic separation medium and disposed to pass an electric current through the chromatographic separation medium, said first electrode being disposed at the upstream end of the chromatographic separation medium in the column lumen and the second electrode being disposed at the downstream end thereof;
• (b) a catalytic gas elimination chamber in fluid communication with the electro elution separator, the catalytic gas elimination chamber being downstream of the electro elution separator, the catalytic gas elimination chamber including a catalyst for combining hydrogen and oxygen gases, or for catalytically decomposing hydrogen peroxide, or both, in an effluent stream to form water and reduce the gas content in the eluent stream, wherein said electro elution separator is the only separator, including chromatographic separation medium disposed in a column lumen, in said chromatography apparatus;
• and
• (c) a detector in fluid communication with the electro elution separator and the catalytic gas elimination chamber, the detector being downstream of the electro elution separator.