# ISO 7766-1:1993 — Withdrawn and superseded ISO standards

For ISO 7766-1:1993, item title is Photography — Processing wastes — Analysis of cyanides — Part 1: Determination of hexacyanoferrate(II) and hexacyanoferrate(III) by spectrometry; status code is 9599; successor is ISO 7766:2003; withdrawn / published date is 1993-01-21, recorded from its source on 2026-08-05.

- **Identifier:** ISO 7766-1:1993 _(verified: appears in the quote below)_
- **Item title:** Photography — Processing wastes — Analysis of cyanides — Part 1: Determination of hexacyanoferrate(II) and hexacyanoferrate(III) by spectrometry _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 7766:2003
- **Withdrawn / published date:** 1993-01-21 _(verified: appears in the quote below)_

## What the source says

> 14631,IS,,ISO 7766-1:1993,Photography — Processing wastes — Analysis of cyanides — Part 1: Determination of hexacyanoferrate(II) and hexacyanoferrate(III) by spectrometry,Photographie — Effluents de traitement — Analyse des cyanures — Partie 1: Détermination de l'hexacyanoferrate(II) et de l'hexacyanoferrate(III) par spectrométrie,1993-01-21,1,"['37.040.30','13.030.30']",ISO/TC 42,9599,,[34988],['en'],5,"<p>The principle of the test method specified is treating a sample of effluent, or diluted effluent, with a mixture of iron(II) and iron(III) ions. If Fe(CN)<sub>6</sub> is present, a blue suspension will form. In the range of 1,0 mg/l to 10,0 mg/l, this suspension is stable and its absorban

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).