ISO 3198:1975
Sodium hydroxide for industrial use — Determination of sulphur compounds — Method by reduction and titrimetry
Reference number
ISO 3198:1975
Edición 1
1975-08
Retirada
ISO 3198:1975
8395
Retirada (Edición 1, 1975)

Resumen

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 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.

Informaciones generales

  •  : Retirada
     : 1975-08
    : Retirada de la Norma Internacional [95.99]
  •  : 1
     : 6
  • ISO/TC 47
    71.060.40 
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