716969

ISO 2833:1973

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

standard by International Organization for Standardization , 12/01/1973

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Full Description

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.

 

Product Details

Published:
12/01/1973
Number of Pages:
5
File Size:
1 file , 430 KB
Note:
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