# ISO/R 1595:1970 — Withdrawn and superseded ISO standards

For ISO/R 1595:1970, item title is Urea for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method; status code is 9599; successor is ISO/CD 1595; withdrawn / published date is 1970-07-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO/R 1595:1970 _(verified: appears in the quote below)_
- **Item title:** Urea 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 1595
- **Withdrawn / published date:** 1970-07-01 _(verified: appears in the quote below)_

## What the source says

> 6187,R,,ISO/R 1595:1970,"Urea for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method","Urée à usage industriel — Dosage du fer — Méthode photométrique au 2,2'- bipyridyle",1970-07-01,1,['71.080.30'],ISO/TC 47,9599,,[6186],"['en','fr']",3,"<p>Describes a method applicable to iron contents greater than or equal to 0.00005 % (m/m). The principle is based on the ignition of the material at 800 °C and fusion of the residue with anhydrous potassium hydrogen sulphate. Solution of the cooled melt in hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2,2'bipyridyl complex in the presence of a buffered solution

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).