Résumé
Applies for the determination of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products having an iron content equal to or greater than 0,020 % (m/m). The principle consists in dissolution of a test portion by either alkaline or acid fusion. Reduction of iron(III) with hydroxylammonium chloride, formation of the complex iron(II)-1, 10-phenathroline in a buffered medium at pH value between 3,5 and 4,2. Photometric measurement of the coloured complex at a wavelength of about 510 nm. Applies ISO Recommendation R 1694-1970.
Informations générales
-
État actuel: PubliéeDate de publication: 1976-09Stade: Clôture de l'examen [90.60]
-
Edition: 1Nombre de pages: 5
-
Comité technique :ISO/TC 226ICS :71.060.50
- RSS mises à jour
Cycle de vie
-
Actuellement
PubliéeISO 1694:1976
Les normes ISO sont réexaminées tous les cinq ans
Stade: 90.60 (En cours d'examen)
