Reference number
ISO 2272:1989
ISO 2272:1989
© ISO 2024
International Standard
ISO 2272:1989
Surface active agents — Soaps — Determination of low contents of free glycerol by molecular absorption spectrometry
Edition 2
1989-07
1989-07
ISO 2272:1989
7096
Published
(Edition 2, 1989)
This publication was last reviewed and confirmed in 2021.
Therefore this version remains current.
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.
Life cycle
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Previously
WithdrawnISO 2272:1972
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Now