Status : Published (Under review)

This standard was last reviewed and confirmed in 2020. Therefore this version remains current.
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Abstract

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.

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General information

  • Status
     : Published
    Publication date
     : 1976-09
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 5
  • Technical Committee :
    ISO/TC 226
    ICS :
    71.060.50 
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