# ISO/R 915:1968 — Withdrawn and superseded ISO standards

For ISO/R 915:1968, item title is Sulphuric acid and oleum for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method; status code is 9599; successor is ISO/CD 915; withdrawn / published date is 1968-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO/R 915:1968 _(verified: appears in the quote below)_
- **Item title:** Sulphuric acid and oleum 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 915
- **Withdrawn / published date:** 1968-12-01 _(verified: appears in the quote below)_

## What the source says

> 5321,R,,ISO/R 915:1968,"Sulphuric acid and oleum for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method","Acide sulfurique et oléums à usage industriel — Dosage du fer — Méthode spectrophotométrique au 2,2'- bipyridyle",1968-12-01,1,['71.060.30'],ISO/TC 47,9599,,[5320],"['en','fr']",5,"<p>The principle is based on 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. Spectrophotometric measurement of the coloured complex at a wavelength of about 522 nm. The method is a

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).