A method and apparatus for ion analysis by ion chromatography uses periodic electrolytic regeneration of a packed bed suppressor. First and second sets of columns, suppressors and detectors connected in series are linked by appropriate valving so that the effluent from the second suppressor can be passed...http://www.google.com.au/patents/US5633171?utm_source=gb-gplus-sharePatent US5633171 - Intermittent electrolytic packed bed suppressor regeneration for ion chromatography