ISO 2362:1972

Aluminium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter method
The principle of the method consists in fusion of a test portion with sodium carbonate. Separation of fluorine by distillation with sulphuric acid. Titration with thorium nitrate solution using sodium alizarinsulphonate-methylene blue as indicator. Alternatively, the thorium nitrate titration may be made using only sodium alizarinsulphonate; the end-point being spectrophotometrically determined at 525 nm.
SDO:
ISO
Language:
English
ICS Codes:
71.060.50
Status:
Withdrawn
Publish date:
1972-11-30
Standard Number:
ISO 2362:1972