ISO 1981:1977
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ISO 1981:1977
6712

Abstract 

Two cases are considered: content of nitrous compounds, expressed as HNO2, equal to or greater than 0,01 % (m/m) and content of nitrous compounds, expressed as HNO2, less than 0,01 % (m/m). The principle consists in oxidatiuon of the compounds present in a test portion by an excess of standard volumetric potassium permanganate solution. Addition of an excess of a standard volumetric iron(II) sulphate solution, and titration of this excess with a standard volumetric potassium permanganate solution. Replaces ISO Recommendation R 1981-1971.


General information 

  •  :  Withdrawn
     : 1977-11
  •  : 1
     : 3
  •  : ISO/TC 47 Chemistry
  •  :
    71.060.30 Acids

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