Detection method and apparatus for chromatography
Abstract
Abstract FOR PURPOSES OF DETECTING CHANGES IN AN ELUATE IN CHROMATOGRAPHY A CELL COMPRISING A SOLID DETECTION ELECTRODE AND A REFERENCE ELECTRODE IS CONNECTED IN SERIES WITH A CHROMATOGRAPHIC SEPARATING SYSTEM, THE DETECTION ELECTRODE BEING IN DIRECT FLOWING CONTACT WITH THE ELUATE AND A LIQUID (WHICH MAY BE THE ELUATE ITSELF). A CONTROLLED POTENTIAL DIFFERENCE IS APPLIED TO THE ELECTRODES TO BRING ABOUT A CHEMICAL OXIDATION/REDUCTION REACTION OF THE SUBSTANCES BEING SEPARATED AND THE RELATIONSHIP BETWEEN AT LEAST TWO QUANTITIES INTER-RELATED BY OHM''S LAW IS OBSERVED. PROVISION IS MADE FOR A COMPENSATORY CELL AND FOR THE ELECTRO-CHEMICAL REMOVAL FROM THE ELUANT OF IMPURITIES WHICH INTERFERE WITH THE DETECTION. A PREFERRED CELL IS TUBULAR WITH THE ELECTRODES E.G. OF GRAPHITE OR GLASSY CARBON PROVIDED BY THE WALLS OF THE CELL OR EXTENDING ACROSS THE CELL. D R A W I N G
Inventors
- 👤 Victor Pretorius
- 👤 Hans Helmut Hahn
Bibliographic Details
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