ISO 1618:1976
ISO 1618:1976


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.

Общая информация 

  •  :  Withdrawn
     : 1976-09
  •  : 1
  •  : ISO/TC 226 Materials for the production of primary aluminium
  •  :
    71.100.10 Materials for aluminium production

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