ISO 3194:1975
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ISO 3194:1975
8390

Abstract 

Applicable to products the content of which, expressed as sulphate, is equal or more than 5 mg/kg. The principle consists in the reduction of the sulphur compounds to hydrogen sulphide by heating with a mixture of hydriodic acid and hypophosphorous acid. Distillation of the hydrogen sulphide by a current of purified oxygen-free nitrogen in a mixture of sodium hydroxide and acetone. Titration of the sulphide with standard volumetric mercury(II) nitrate solution in the presence of dithizone as indicator.


General information 

  •  :  Withdrawn
     : 1975-08
  •  : 1
     : 6
  •  : ISO/TC 47 Chemistry
  •  :
    71.060.40 Bases

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