# ISO/R 1982:1971 — Withdrawn and superseded ISO standards

For ISO/R 1982:1971, item title is Nitric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method; status code is 9599; successor is ISO/CD 1982; withdrawn / published date is 1971-05-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO/R 1982:1971 _(verified: appears in the quote below)_
- **Item title:** Nitric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 1982
- **Withdrawn / published date:** 1971-05-01 _(verified: appears in the quote below)_

## What the source says

> 6714,R,,ISO/R 1982:1971,"Nitric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method","Acide nitrique à usage industriel — Dosage du fer — Méthode photométrique au 2,2'- bipyridyle",1971-05-01,1,['71.060.30'],ISO/TC 47,9599,,[6713],"['en','fr']",4,"<p>The method is applicable to the determination of iron contents greater than 0,0001 % (m/m). The principle consists in evaporation of a test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of iron(II)-2,2' -dipyridyl complex in ammonium acetate medium. Photometric measurement of the coloured complex at a wavelength of about 522 nm

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).