Numéro de référence
ISO 1618:1976
ISO 1618:1976
Oxyde d'aluminium principalement utilisé pour la production de l'aluminium — Dosage du vanadium — Méthode photométrique à la N-benzoyl-N-phénylhydroxylamine
Edition 1
1976-09
Annulée
ISO 1618:1976
6215
Annulée (Edition 1, 1976)

Résumé

The method is applicable to products having vanadium contents between 0,0003 % (m/m) and 0,016 % (m/m), provided that the content of chromic oxide and titanic oxide does not exceed 0,002 % (m/m) and 0,006 % (m/m), respectively. The principle consists in a previous oxidation of the vanadium contained in the test sample to vanadium(V) by patassium permanganate in sulphuric acid solution. Formation of the vanadium-N-benzoyl-N-phenylhydroxylamine complex. Extraction of the violet coloured complex with chloroform in hydrochloric acid*solution. Photometric measurement of the coloured complex at a wavelength of about 524 nm.

Informations générales

  •  : Annulée
     : 1976-09
    : Annulation de la Norme internationale [95.99]
  •  : 1
     : 4
  • ISO/TC 226
    71.100.10 
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