# ISO 23753-1:2005 — Withdrawn and superseded ISO standards

For ISO 23753-1:2005, item title is Soil quality — Determination of dehydrogenase activity in soils — Part 1: Method using triphenyltetrazolium chloride (TTC); status code is 9599; successor is ISO 23753-1:2019; withdrawn / published date is 2005-10-27, recorded from its source on 2026-08-05.

- **Identifier:** ISO 23753-1:2005 _(verified: appears in the quote below)_
- **Item title:** Soil quality — Determination of dehydrogenase activity in soils — Part 1: Method using triphenyltetrazolium chloride (TTC) _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 23753-1:2019
- **Withdrawn / published date:** 2005-10-27 _(verified: appears in the quote below)_

## What the source says

> 37975,IS,,ISO 23753-1:2005,Soil quality — Determination of dehydrogenase activity in soils — Part 1: Method using triphenyltetrazolium chloride (TTC),Qualité du sol — Détermination de l'activité des déshydrogénases dans les sols — Partie 1: Méthode au chlorure de triphényltétrazolium (CTT),2005-10-27,1,['13.080.30'],ISO/TC 190/SC 4,9599,,[70145],"['en','fr']",5,"<p>ISO 23753-1:2005 specifies a method for determining the dehydrogenase activity in soil using 2,3,5-triphenyltetrazolium chloride (TTC). It is not applicable for determining the dehydrogenase activity in the upper layers (L, F, H horizons) of forest humus forms with low microbial activity (e.g. mor), or in soils showing reducing pr

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).