# ISO 3239:1975 — Withdrawn and superseded ISO standards

For ISO 3239:1975, item title is Sodium sulphate for industrial use — Determination of iron content — 1,10- Phenanthroline photometric method; status code is 9599; successor is ISO/CD 3239; withdrawn / published date is 1975-07-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 3239:1975 _(verified: appears in the quote below)_
- **Item title:** Sodium sulphate for industrial use — Determination of iron content — 1,10- Phenanthroline photometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 3239
- **Withdrawn / published date:** 1975-07-01 _(verified: appears in the quote below)_

## What the source says

> 8451,IS,,ISO 3239:1975,"Sodium sulphate for industrial use — Determination of iron content — 1,10- Phenanthroline photometric method","Sulfate de sodium à usage industriel — Dosage du fer — Méthode photométrique à la 1,10- phénanthroline",1975-07-01,1,['71.060.50'],ISO/TC 47,9599,,[8452],"['en','fr']",4,"<p>Applicable to products the Fe content of which is equal to or more than 0.0003 % (m/m). Dissolution of the test sample in delute hydrochloric acid and bromine water by heating. Preliminary reduction of the iron(III) by hydroxylammonium chloride. Formation of the iron(II)-1,10-phenanthroline complex in a buffered medium. Photometric measurement of the coloured complex at a wavelength of ab

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).