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ISO 2272:1989

Surface active agents -- Soaps -- Determination of low contents of free glycerol by molecular absorption spectrometry
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ISO 2272:1989

Surface active agents -- Soaps -- Determination of low contents of free glycerol by molecular absorption spectrometry

PUBLISH DATE 1989
ISO 2272:1989

The determination is carried out in the following way:

Decomposition of the soap by sulfuric acid and extraction of the fatty acids 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 proportional to the free glycerol content.

Spectrometric measurement of the absorbance at a wavelength about 571 nm.

SDO ISO: International Organization for Standardization
Document Number ISO 2272
Publication Date July 15, 1989
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 91
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