# ISO 3698:1976 — Withdrawn and superseded ISO standards

For ISO 3698:1976, item title is Potassium hydroxide for industrial use — Determination of calcium and magnesium contents — Flame atomic absorption method; status code is 9599; successor is ISO/WD 3698; withdrawn / published date is 1976-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 3698:1976 _(verified: appears in the quote below)_
- **Item title:** Potassium hydroxide for industrial use — Determination of calcium and magnesium contents — Flame atomic absorption method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/WD 3698
- **Withdrawn / published date:** 1976-12-01 _(verified: appears in the quote below)_

## What the source says

> 9172,IS,,ISO 3698:1976,Potassium hydroxide for industrial use — Determination of calcium and magnesium contents — Flame atomic absorption method,Hydroxyde de potassium à usage industriel — Dosages du calcium et du magnésium — Méthode par absorption atomique dans la flamme,1976-12-01,1,['71.060.40'],ISO/TC 47,9599,,[9173],"['en','fr']",4,"<p>Applicable to products having contents of more than 2.5 mg Ca/kg and 0.5 mg Mg/kg if an acetylene-air flame is used or 0.6 mg Ca/kg and 1.0 mg Mg/kg if an acetylen-dinitrogen monoxide flame is used. The principle consists in the acidification of a test portion with hydrochloric acid, aspiration of the solution into an acetylene-dinitrogen monoxide flame o

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).