ISO 2761:1975
w
ISO 2761:1975
7741

Abstract 

Applicable to products having contents up to 0.1 % (m/m). The method specified is not applicable in the presence of vanadium or high silica content. Molybdenum and chromium also interfere. The analysis bases on fusion of a test portion with sodium corbonate, extraction of the cooled melt with suphuric acid and the addition of hydrogen peroxide. Photometric measurement of the yellow coloured complex formed at a wavelength of about 420 nm.


General information 

  •  :  Withdrawn
     : 1975-03
  •  : 1
     : 2
  •  : ISO/TC 47 Chemistry
  •  :
    71.060.50 Salts

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