Patent ID: 6316270
Filing Date: 2001-11-13
Classification: B01J,G01N,Y10T

Abstract:
A method of generating an eluent and using the same in anion analysis comprising(a) flowing a first aqueous stream in a first direction through a flowthrough first cation exchange bed including exchangeable cations and having an inlet portion and an outlet portion, while applying an electrical potential between an anode in electrical communication with the inlet portion of said first cation exchange bed and a cathode in electrical communication with the outlet portion of said first cation exchange bed to electrolytically generate hydroxide ions and to electromigrate exchangeable cations into said first aqueous stream to form a first eluent comprising a base, said first cation exchange bed comprising an upstream bed portion comprising a strongly acidic cation exchange material and an adjacent downstream bed portion comprising a weakly acidic cation exchange material,(b) flowing a first liquid sample stream containing anions to be detected and said first eluent through a chromatographic separator in which said anions to be detected are separated, forming a first chromatography effluent, and(c) flowing said first chromatography effluent, with or without further treatment, past a detector in which the separated anions in said first chromatography effluent are detected.