International Standard
ISO 2272:1989
Surface active agents — Soaps — Determination of low contents of free glycerol by molecular absorption spectrometry
Reference number
ISO 2272:1989
Edition 2
1989-07
© ISO 2024
International Standard
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Published (Edition 2, 1989)
This standard was last reviewed and confirmed in 2021. Therefore this version remains current.

ISO 2272:1989

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Language
CHF 42
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Abstract

The determination is carried out in the following way: Decomposition of the soap by sulfuric acid and extraction of the fatty acida with light petroleum. Oxidation of the free glycerol remaining in the aqueous phase by periodic acid to formic acid and formaldehyde. On reaction with chromotropic acid, the aldehyde formed gives an absorbing compound whose absorbance is propotional to the free glycerol content. Spectrometric measurement of the absorbance at a wavelength about 571 mm.

General information

  • Status
     : Published
    Publication date
     : 1989-07
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 2
    Number of pages
     : 3
  • Technical Committee :
    ISO/TC 91
    ICS :
    71.100.40 
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