# ISO 331:1983 — Withdrawn and superseded ISO standards

For ISO 331:1983, item title is Coal — Determination of moisture in the analysis sample — Direct gravimetric method; status code is 9599; successor is ISO/WD 331; withdrawn / published date is 1983-09-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 331:1983 _(verified: appears in the quote below)_
- **Item title:** Coal — Determination of moisture in the analysis sample — Direct gravimetric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/WD 331
- **Withdrawn / published date:** 1983-09-01 _(verified: appears in the quote below)_

## What the source says

> 4274,IS,,ISO 331:1983,Coal — Determination of moisture in the analysis sample — Direct gravimetric method,Charbon — Détermination de l'humidité de l'échantillon pour analyse — Méthode gravimétrique directe,1983-09-01,2,['73.040'],ISO/TC 27/SC 5,9599,,[1059],"['en','fr']",3,"<p>The sample of coal is heated at 105 to 110 °C in a stream of oxygen-free, dry nitrogen and the moisture driven off is collected in an absorption tube containing a desiccant. The increase in mass of the absorption tube (after deducting the result of a separate blank determination) is due to moisture in the sample of coal.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).