Analysis of soaps -- Determination of total alkali content and total fatty matter content
This standard was last reviewed and confirmed* in 2016.
The method consists in decomposition of the soap by a known volume of standard volumetric mineral acid solution, extraction and separation of the liberated fatty matter with light petroleum and determination of a total alkali content by titration of the excess of acid contained in the aqueous phase with a standard volumetric sodium hydroxide solution. After evaporation of the light petroleum from the extract, dissolution of the residue in ethanol and neutralization of the fatty acids with a standard volumetric potassium hydroxide solution. Evaporation of the ethanol and weighing of the soap formed to determine the total fatty matter content.
Document published on: 1975-10-01 Edition: 1 (Monolingual) ICS: 71.100.40 Status: Published Stage: 90.93 (2016-09-21) TC/SC: ISO/TC 91 Number of Pages: 3
Revises: ISO/R 455:1965
No corrigenda or amendments available