Reference number
ISO 2362:1972
© ISO 2024
ISO 2362:1972
Aluminium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter method
Edition 1
1972-12
Withdrawn
Withdrawn (Edition 1, 1972)

Abstract

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.

General information

  • Status
     : Withdrawn
    Publication date
     : 1972-12
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 5
  • Technical Committee :
    ISO/TC 47
    ICS :
    71.060.50 
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