Numéro de référence
ISO 9438:1993
ISO 9438:1993
© ISO 2025
ISO 9438:1993
Spaths fluor utilisables dans l'industrie métallurgique — Dosage du phosphore total — Méthode spectrométrique au molybdophosphate réduit
Edition 2
1993-03
1993-03
Annulée
Résumé
The principle of the method specified is to decompose a test portion by alkaline fusion and subsequent dissolution of the melt in excess of nitric acid, precipitation of iron(III) phosphate with ammonia solution, dissolution of the precipitate in nitric acid, formation of the molybdophosphate complex and extraction, followed by selective reduction of the complex to molybdenum blue, spectrometric measurement of the absorbance of the coloured complex at the wavelength of maximum absorption (about 710 nm). Applies to products having total phosphorus contents, expressed as PO4^3-, in the range 0,01 % (m/m) to 1,0 % (m/m).
Cycle de vie
-
Précédemment
AnnuléeISO 9438:1989
-
Actuellement