Aktívna norma | Vydaná: 01.08.1976

ISO 3360:1976

Phosphoric acid and sodium phosphates for industrial use (including foodstuffs) — Determination of fluorine content — Alizarin complexone and lanthanum nitrate photometric method
(Acide phosphorique et phosphates de sodium a usage industriel (y compris les industries alimentaires) — Dosage du fluor — Méthode photométrique au complexone d´alizarine et nitrate de lanthane)

Dostupné jazyky: Anglicky, Francúzsky

Dostupné prevedenie: Elektronické PDF, Tlačené

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Podrobné informácie

Označenie: ISO 3360:1976

Dátum vydania: 01.08.1976

Stránok: 5

Krajina: Medzinárodná technická norma

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Anotácia

Description / Abstract: Applicable to products the F content of which is equal to or more than 0.5 mg/kg. Specifies the separation of the element from a test portion by steam distillation in a phosphoric acid medium. Formation of a blue-coloured complex with a combined reagent alizarin complexone/lanthanum nitrate in a buffered medium at the pH of 4.6. Addition of acetone to increase the stability of the complex and the sensitivity. Photometric measurement of the complex at a wavelength of about 600 nm.

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