Galvanic-Coulometric Detectors in Gas Chromatography

  • Paul Hersch


Among the most sensitive detectors for gas chromatography are those based on coulometry. They owe their sensitivity to the high value of the faraday and to the ease with which minute electric currents are measurable. Electrometers with a discrimination for less than 10-15 amp are available, a current corresponding to about 10-20 equivalents per sec, or 6000 univalent ions per sec. For example, take anthracene, C14H10. A coulometrically quantitative oxidation of one molecule means stripping it of 14 × 4 + 10 × 1 = 66 electrons. Thus, a stream of fewer than 100 molecules per sec of this compound is detectable in principle. In the case of compounds with more carbon and hydrogen atoms in the molecule, the sensitivity in these terms is higher still, compensating for their lesser volatility.


Cavity Cell Hydrogen Halide Electrolytic Manganese Dioxide Manganous Oxide Loop Cell 
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Copyright information

© Plenum Press 1967

Authors and Affiliations

  • Paul Hersch
    • 1
  1. 1.Gould-National Batteries, Inc.MinneapolisUSA

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