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ISO 685:1975

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

Oct 1, 1975
95.99   Withdrawal of Standard   Feb 28, 2020

General information

95.99     Feb 28, 2020

ISO

ISO/TC 91

International Standard

71.100.40  

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO/R 455:1965

NOW

WITHDRAWN
ISO 685:1975
95.99 Withdrawal of Standard
Feb 28, 2020

REVISED BY

PUBLISHED
ISO 685:2020

National adoptions

SRPS ISO 685:1992  
ISS

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

95.99   Withdrawal of Standard

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