# ISO 4831:1991 — Withdrawn and superseded ISO standards

For ISO 4831:1991, item title is Microbiology — General guidance for the enumeration of coliforms — Most probable number technique; status code is 9599; successor is ISO 4831:2006; withdrawn / published date is 1991-03-14, recorded from its source on 2026-08-05.

- **Identifier:** ISO 4831:1991 _(verified: appears in the quote below)_
- **Item title:** Microbiology — General guidance for the enumeration of coliforms — Most probable number technique _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 4831:2006
- **Withdrawn / published date:** 1991-03-14 _(verified: appears in the quote below)_

## What the source says

> 10812,IS,,ISO 4831:1991,Microbiology — General guidance for the enumeration of coliforms — Most probable number technique,Microbiologie — Directives générales pour le dénombrement des coliformes — Technique du nombre le plus probable,1991-03-14,2,['07.100.30'],ISO/TC 34/SC 9,9599,[10811],[38280],"['en','fr']",11,"<p>This second edition cancels and replaces the first edition (ISO 4831:1978). It is intended to provide general guidance for the examination of products not dealt with by existing International Standards. These guidelines may not be appropriate for some products in every detail, and for some other products it may be necessary to use different methods. The technique described here i

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).