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.
État actuel: PubliéeDate de publication: 1976-08Stade: Norme internationale confirmée [90.93]
Edition: 1Nombre de pages: 5
Comité technique :ISO/TC 47
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