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Liquid chromatograph with electrochemical detector and method

  • US 4,511,659 A
  • Filed: 02/17/1984
  • Issued: 04/16/1985
  • Est. Priority Date: 03/04/1983
  • Status: Expired due to Term
First Claim
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1. An electrochemical detection apparatus for electrochemically testing a sample containing reversible and irreversible electrochemically active materials in solution, said apparatus comprising:

  • at least three coulometric electrochemical flow cell, each of said cells having therein at least one working electrode, at least one counter electrode and at least one reference electrode, said plurality of electrochemical cells being arranged in series and defining collectively at least one flow channel for said sample solution;

    means for connecting each said reference electrode to a reference potential;

    means connecting each said counter electrode to a counter potential; and

    means connecting each said working electrode to a working potential, at least two of said cells constituting gate cells, each of said gate cells having means for maintaining its working electrode at a different potential from the other, one of said gate cells being at a potential to oxidize electrochemcially active materials in said sample and another of said gate cells being at a potential to reduce electrochemically active materials in said samplesaid remaining cell or cells having means for maintaining its working electrode at a potential to detect and coulometrically measure electrochemically reversible materials in said sample.

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