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ISO 685:1975

Analysis of soaps -- Determination of total alkali content and total fatty matter content

General information

Withdrawn from 28.02.2020
Directives or regulations
None

Standard history

Status
Date
Type
Name
28.02.2020
Main
01.10.1975
Main
Main
ISO/R 455:1965
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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