ISO 2272:1989 Preview
Surface active agents -- Soaps -- Determination of low contents of free glycerol by molecular absorption spectrometry
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
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.
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