ISO 1694:1976
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ISO 1694:1976
6310

Abstract  Preview

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.


General information 

  •  :  Published
     : 1976-09
  •  : 1
     : 5
  •  : ISO/TC 226 Materials for the production of primary aluminium
  •  :
    71.060.50 Salts

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