ISO-2833 › Sodium fluoride for industrial use -- Determination of fluorine content -- Modified Willard-Winter method
ISO-2833
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1ST EDITION
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CURRENT
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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.
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Document Number
ISO 2833:1973
Revision Level
1ST EDITION
Status
Current
Publication Date
Dec. 15, 1973
Committee Number
ISO TC 47