ISO/TC 47 Chemie,
ISO/TC 47 Chemistry,
ISO/TC 47 Chimie,
ISO Internationale Organisation für Normung,
ISO International Organization for Standardization,
ISO Organisation Internationale de Normalisation
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Media type:
Standard
Title:
ISO 3360
:
Phosphoric acid and sodium phosphates for industrial use (including foodstuffs); Determination of fluorine content; Alizarin complexone and lanthanum nitrate photometric method
Other titles:
Phosphorsäure und Natriumphosphate für Industriezwecke (einschließlich Nahrungsmittel); Bestimmung des Fluorgehalts: Fotometrische Methode mit Alizarinkomplexon und Lanthannitrat
Acide phosphorique et phosphates de sodium à usage industriel (y compris les industries alimentaires); Dosage du fluor; Méthode photométrique au complexone d'alizarine et nitrate de lanthane
Description:
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.