ISO 804:1976
Aluminium oxide primarily used for the production of aluminium; Preparation of solution for analysis; Method by alkaline fusion

Standard No.

ISO 804:1976

Release Date

1976

Published By

International Organization for Standardization (ISO)

Latest

ISO 804:1976

Scope

The procedure for the preparation of a principal solution for chemical analysis requires at first an alkaline fusion of the test portion, either with a mixture of sodium carbonate and boric acid or with a mixture of sodium carbonate and sodium tetraborate. Subsequent dissolution of the molten mass in an excess of nitric acid and adjustment of an appropriate aliquot portion to pH 2. Replaces ISO Recommendation R804/1968.

ISO 804:1976 history

• 1976 ISO 804:1976 Aluminium oxide primarily used for the production of aluminium; Preparation of solution for analysis; Method by alkaline fusion