# ISO 6851:1987 — Withdrawn and superseded ISO standards

For ISO 6851:1987, item title is Photography — Processing waste — Determination of total amino nitrogen — Microdiffusion Kjeldahl method; status code is 9599; successor is ISO 6851:2001 | ISO/DIS 6851; withdrawn / published date is 1987-11-26, recorded from its source on 2026-08-05.

- **Identifier:** ISO 6851:1987 _(verified: appears in the quote below)_
- **Item title:** Photography — Processing waste — Determination of total amino nitrogen — Microdiffusion Kjeldahl method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 6851:2001 | ISO/DIS 6851
- **Withdrawn / published date:** 1987-11-26 _(verified: appears in the quote below)_

## What the source says

> 13360,IS,,ISO 6851:1987,Photography — Processing waste — Determination of total amino nitrogen — Microdiffusion Kjeldahl method,Photographie — Effluents de traitements — Détermination de l'azote amino total — Méthode de microdiffusion Kjeldahl,1987-11-26,1,"['37.040.30','13.030.30']",ISO/TC 42,9599,,"[32493,27566]","['en','fr']",4,<p>Describes a method for determining the total organic nitrogen and any ammoniacal nitrogen present in photographic processing waste. This amino nitrogen is converted to ammonia which is subsequently determined by absorption into boric acid in a microdiffusion cell along with any ammonia originally present.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).