Gives the potentiometric and visual methods als alternatives for the final titration. The principle consists in the combustion of the sulphur in a current of oxygen. Oxidation and fixation of the sulphur dioxide and trioxide gases in chromic and sulphuric acid solutions. Absorption of the carbon dioxide formed in a solution of barium hydroxide, followed by titration in the presence of phenolphthalein and screened methylorange (by xylene cyanol FF) as indicator. Has also been approved by the IUPAC.

General information

  • Status :  Withdrawn
    Publication date : 1974-11
  • Edition : 1
    Number of pages : 5
  • :
    ISO/TC 47
  • 71.060.10
    Chemical elements

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