# ISO 1952:1976 — Withdrawn and superseded ISO standards

For ISO 1952:1976, item title is Brown coals and lignites — Method of extraction for the determination of sodium and potassium soluble in dilute hydrochloric acid; status code is 9599; successor is ISO/DIS 1952 | ISO 1952:2008; withdrawn / published date is 1976-06-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 1952:1976 _(verified: appears in the quote below)_
- **Item title:** Brown coals and lignites — Method of extraction for the determination of sodium and potassium soluble in dilute hydrochloric acid _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/DIS 1952 | ISO 1952:2008
- **Withdrawn / published date:** 1976-06-01 _(verified: appears in the quote below)_

## What the source says

> 6679,IS,,ISO 1952:1976,Brown coals and lignites — Method of extraction for the determination of sodium and potassium soluble in dilute hydrochloric acid,Charbons bruns et lignites — Méthode d'extraction en vue des dosages du sodium et du potassium solubles dans l'acide chlorhydrique dilué,1976-06-01,1,['73.040'],ISO/TC 27,9599,,"[33582,41590]","['en','fr']",2,"<p>The sample of brown coal or lignite is extracted with boiling 0,005 N hydrochloric acid and the extract centrifuged. The sodium and potassium in solution are determined by any precise analytical method (for example, gravimetric method or flame photometric method).</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).