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ISO 2833:1973

Sodium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter method

STANDARD published on 1.12.1973

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The information about the standard:

Designation standards: ISO 2833:1973
Publication date standards: 1.12.1973
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: International technical standard
Category: Technical standards ISO

Annotation of standard text ISO 2833:1973 :

Description / Abstract: The principle consists in separation of the fluorine from a test portion by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution using sodium alizarinsuphonate and methylene blue as indicators. Alternatively the thorium nitrate titration may be carried out using sodium alizarinsuphonate alone as indicator, the end-point being determined spectrophotometrically under carefully defined conditions. The absorbance at a wavelength of 525 nm shall reach the arbitrary value of 0.6. Has also been approved by the IUPAC.