Intermittent electrolytic packed bed suppressor regeneration for ion chromatography

  • US 5,773,615 A
  • Filed: 02/13/1996
  • Issued: 06/30/1998
  • Est. Priority Date: 03/03/1995
  • Status: Expired due to Term
First Claim
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1. A method of anion or cation analysis by ion chromatography using periodic electrolytic chemical regeneration of a packed bed suppressor, said method comprising(a) chromatographically separating ionic species in a first liquid sample in a water-containing first eluent solution comprising electrolyte, to form a first chromatography effluent including separated ionic species,(b) flowing said first chromatography effluent through a first packed bed suppressor including first suppressor ion exchange resin with first exchangeable ions to convert said electrolyte to weakly ionized form during suppression, thereby depleting at least some of said first exchangeable ions on said first suppressor ion exchange resin, said first chromatography effluent exiting as a first suppressor effluent,(c) flowing the first suppressor effluent including the separated ionic species from said first packed bed suppressor through a first detector in which the separated ionic species are detected to form a detector effluent, and(d) applying an electrical potential through said first packed resin bed suppressor while flowing an aqueous liquid stream therethrough to electrolyze water in said aqueous liquid stream and thereby regenerate the first exchangeable ions on said first suppressor ion exchange resin, the application of said electrical potential being discontinued during steps (a), (b) and (c).

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