# ISO 685:1975 — Withdrawn and superseded ISO standards

For ISO 685:1975, item title is Analysis of soaps — Determination of total alkali content and total fatty matter content; status code is 9599; successor is ISO 685:2020; withdrawn / published date is 1975-10-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 685:1975 _(verified: appears in the quote below)_
- **Item title:** Analysis of soaps — Determination of total alkali content and total fatty matter content _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 685:2020
- **Withdrawn / published date:** 1975-10-01 _(verified: appears in the quote below)_

## What the source says

> 4880,IS,,ISO 685:1975,Analysis of soaps — Determination of total alkali content and total fatty matter content,Analyse des savons — Détermination des teneurs en alcali total et en matière grasse totale,1975-10-01,1,['71.100.40'],ISO/TC 91,9599,[4477],[69675],"['en','fr']",3,"<p>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, dissolut

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).