Aktivní norma | Vydána: 01.12.1973

ISO 2833:1973

Sodium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter method
(Fluorure de sodium a usage industriel — Dosage du fluor — Méthode Willard-Winter modifiée)

Dostupné jazyky: Anglicky, Francouzsky

Dostupné provedení: Elektronické PDF, Tištěné

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Podrobné informace

Označení: ISO 2833:1973

Datum vydání: 01.12.1973

Stran: 5

Země: Mezinárodní technická norma

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Anotace

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.

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