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.
Status: WithdrawnPublication date: 1988-04
Edition: 1Number of pages: 2
Technical Committee: ISO/TC 61/SC 5 Physical-chemical properties
- ICS :
- 71.080.30 Organic nitrogen compounds
ISO 8660:1988Stage: 95.99
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