ISO 8660:1988
ISO 8660:1988


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 

  •  :  Withdrawn
     : 1988-04
  •  : 1
     : 2
  •  : ISO/TC 61/SC 5 Physical-chemical properties
  •  :
    71.080.30 Organic nitrogen compounds

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