# ISO 984:1974 — Withdrawn and superseded ISO standards

For ISO 984:1974, item title is Sodium hydroxide for industrial use — Determination of silica content — Reduced silico-molybdic complex photometric method; status code is 9599; successor is ISO/CD 984; withdrawn / published date is 1974-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 984:1974 _(verified: appears in the quote below)_
- **Item title:** Sodium hydroxide for industrial use — Determination of silica content — Reduced silico-molybdic complex photometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 984
- **Withdrawn / published date:** 1974-12-01 _(verified: appears in the quote below)_

## What the source says

> 5424,IS,,ISO 984:1974,Sodium hydroxide for industrial use — Determination of silica content — Reduced silico-molybdic complex photometric method,Hydroxyde de sodium à usage industriel — Dosage de la silice — Méthode photométrique au complexe silicomolybdique réduit,1974-12-01,1,['71.060.40'],ISO/TC 47,9599,,[5425],"['en','fr']",3,"<p>The method is applicable to products having silica contents exceeding 10 mg/kg. The principle is based on the formation of yellow oxidized silico-molybdic complex in a strongly acid medium, in the presence of boric acid to suppress interference by fluorides. Selective reduction of this complex with a mixture of aminonaphtholsulphonic acid (4-amino-3-hydroxynapht

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).