# ISO 622:1981 — Withdrawn and superseded ISO standards

For ISO 622:1981, item title is Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method; status code is 9599; successor is ISO 622:2016; withdrawn / published date is 1981-08-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 622:1981 _(verified: appears in the quote below)_
- **Item title:** Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 622:2016
- **Withdrawn / published date:** 1981-08-01 _(verified: appears in the quote below)_

## What the source says

> 4742,IS,,ISO 622:1981,Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method,Combustibles minéraux solides — Dosage du phosphore — Méthode photométrique au molybdophosphate réduit,1981-08-01,1,['75.160.10'],ISO/TC 27/SC 5,9599,[5342],[70208],"['en','fr']",4,<p>For taking the phosphorus into solution the following two methods are specified: The carbonaceous material is removed by ashing in amuffle furnace under specified conditions and the phosphorus is extracted by treatment with hydrofluoric and sulphuric acids. The carbonaceous material is removed by repeated oxidation with nitric acid in the presence of sulphuric acid. The determination is

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).