# ISO/R 909:1968 — Withdrawn and superseded ISO standards

For ISO/R 909:1968, item title is Hydrochloric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method; status code is 9599; successor is ISO/CD 909; withdrawn / published date is 1968-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO/R 909:1968 _(verified: appears in the quote below)_
- **Item title:** Hydrochloric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 909
- **Withdrawn / published date:** 1968-12-01 _(verified: appears in the quote below)_

## What the source says

> 5314,R,,ISO/R 909:1968,"Hydrochloric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method","Acide chlorhydrique à usage industriel — Dosage du fer — Méthode spectrophotométrique au 2,2'- bipyridyle",1968-12-01,1,['71.060.30'],ISO/TC 47,9599,,[5313],"['en','fr']",5,"<p>The principle consists in evaporation of the test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2.2'-bipyridyl complex in a buffered medium at a pH value between 4.5 and 6. Photometric measurement of the coloured complex at a wavelength of about 522 nm.</p>"

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).