# ISO 3771:1977 — Withdrawn and superseded ISO standards

For ISO 3771:1977, item title is Petroleum products — Total base number — Perchloric acid potentiometric titration method; status code is 9599; successor is ISO 3771:1994; withdrawn / published date is 1977-01-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 3771:1977 _(verified: appears in the quote below)_
- **Item title:** Petroleum products — Total base number — Perchloric acid potentiometric titration method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 3771:1994
- **Withdrawn / published date:** 1977-01-01 _(verified: appears in the quote below)_

## What the source says

> 9291,IS,,ISO 3771:1977,Petroleum products — Total base number — Perchloric acid potentiometric titration method,Produits pétroliers — Détermination de l'indice de base total — Méthode par titrage potentiométrique à l'acide perchlorique,1977-01-01,1,['75.080'],ISO/TC 28,9599,,[21736],"['en','fr']",6,

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).