# ISO 4284:1978 — Withdrawn and superseded ISO standards

For ISO 4284:1978, item title is Acid-grade fluorspar — Determination of sulphide content — Iodometric method; status code is 9599; successor is ISO 4284:1988 | ISO 4284:1993; withdrawn / published date is 1978-07-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 4284:1978 _(verified: appears in the quote below)_
- **Item title:** Acid-grade fluorspar — Determination of sulphide content — Iodometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 4284:1988 | ISO 4284:1993
- **Withdrawn / published date:** 1978-07-01 _(verified: appears in the quote below)_

## What the source says

> 10127,IS,,ISO 4284:1978,Acid-grade fluorspar — Determination of sulphide content — Iodometric method,Spaths fluor pour la fabrication de l'acide fluorhydrique — Dosage des sulfures — Méthode iodométrique,1978-07-01,1,['73.080'],ISO/TC 175,9599,,"[10128,10129]","['en','fr']",4,

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).