Equal volumes of potassium permanganate solution are added to a carpolactam test solution and to a blank (water). After standing for a specified time the absorbance, at a wavelength of 420 nm, of the test solution and of the blank are compared in cells of 5 cm thickness. The permanganat index is the difference between the absorbance of the test sample and that of the blank, multiplied by 100/3. It is a conventional measure of the content of oxidizable impurities.

General information

  • Status :  Withdrawn
    Publication date : 1988-04
  • Edition : 1
    Number of pages : 2
  • :
    ISO/TC 61/SC 5
    Physical-chemical properties
  • 71.080.30
    Organic nitrogen compounds

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