ISO-685 › Historical Revision Information
Analysis of Soaps - Determination of Total Alkali Content &Total Fatty Matter Content
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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.
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Document Number
ISO 685:1975
Revision Level
1ST EDITION
Status
Superseded
Publication Date
Oct. 15, 1975
Committee Number
ISO TC 91