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ISO 2833:1973

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

Dec 1, 1973

General information

90.93     Nov 29, 2023

ISO

ISO/TC 47

International Standard

71.060.50  

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 2833:1973
90.93 Standard confirmed
Nov 29, 2023

National adoptions

SRPS H.B8.174:1979  
ISS

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

95.99   Withdrawal of Standard

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