# ISO 3198:1975 — Withdrawn and superseded ISO standards

For ISO 3198:1975, item title is Sodium hydroxide for industrial use — Determination of sulphur compounds — Method by reduction and titrimetry; status code is 9599; successor is ISO/CD 3198; withdrawn / published date is 1975-08-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 3198:1975 _(verified: appears in the quote below)_
- **Item title:** Sodium hydroxide for industrial use — Determination of sulphur compounds — Method by reduction and titrimetry _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 3198
- **Withdrawn / published date:** 1975-08-01 _(verified: appears in the quote below)_

## What the source says

> 8395,IS,,ISO 3198:1975,Sodium hydroxide for industrial use — Determination of sulphur compounds — Method by reduction and titrimetry,Hydroxyde de sodium à usage industriel — Dosage des composés soufrés — Méthode par réduction et titrimétrie,1975-08-01,1,['71.060.40'],ISO/TC 47,9599,,[8396],"['en','fr']",6,"<p>Applicable to products the content of which, expressed as sulphate, is equal or more than 5 mg/kg. The principle consists in the reduction of the sulphur compounds to hydrogen sulphide by heating with a mixture of hydriodic acid and hypophosphorous acid. Distillation of the hydrogen sulphide by a current of oxygen-free nitrogen in a mixture of sodium hydroxide and acetone. Titration of

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).