# ISO 9408:1991 — Withdrawn and superseded ISO standards

For ISO 9408:1991, item title is Water quality — Evaluation in an aqueous medium of the 'ultimate' aerobic biodegradability of organic compounds — Method by determining the oxygen demand in a closed respirometer; status code is 9599; successor is ISO 9408:1999; withdrawn / published date is 1991-01-24, recorded from its source on 2026-08-05.

- **Identifier:** ISO 9408:1991 _(verified: appears in the quote below)_
- **Item title:** Water quality — Evaluation in an aqueous medium of the 'ultimate' aerobic biodegradability of organic compounds — Method by determining the oxygen demand in a closed respirometer _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 9408:1999
- **Withdrawn / published date:** 1991-01-24 _(verified: appears in the quote below)_

## What the source says

> 17107,IS,,ISO 9408:1991,Water quality — Evaluation in an aqueous medium of the 'ultimate' aerobic biodegradability of organic compounds — Method by determining the oxygen demand in a closed respirometer,"Qualité de l'eau — Évaluation, en milieu aqueux, de la biodégradabilité aérobie 'ultime' des composés organiques — Méthode par détermination de la demande en oxygène dans un respiromètre fermé",1991-01-24,1,['13.060.70'],ISO/TC 147/SC 5,9599,,[28120],"['en','fr']",10,

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).