Résumé

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Three cases, defined by a preliminary test, are envisaged: silicates containing neither sulphides nor chlorates; silicates containing sulphides; silicates containing chlorates. The method based on boiling of an acidified test portion containing methyl orange and with a lead paper strip in the vapour. The presence of sulphides produces blackening of the paper and the presence of chlorates decolorizes the methyl orange. Volumetric*measurement of carbon dioxide evolved from silicates containing neither sulphides nor chlorates by reaction with a hydrochloric acid solution. The principle for the oxidation of sulphides and the reduction of chlorates are specified.


Informations générales 

  • État actuel
     : Publiée
    Date de publication
     : 1976-07
  • Edition
     : 1
    Nombre de pages
     : 5
  • Comité technique
     : ISO/TC 47 Chimie
  • ICS
     :
    71.060.50 Sels

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  5. 71
  6. 71.060
  7. 71.060.50
  8. ISO 1691:1976