ISO 10702:1993 Preview

Steel and iron -- Determination of nitrogen content -- Titrimetric method after distillation

The principle of the method specified is dissolving a test portion in hydrochloric acid followed by oxidation with hydrogen peroxide, fuming of the acid-insoluble residue in sulfuric acid with potassium sulfate and copper(II) sulfate, distilling the solution made alkaline with sodium hydroxide, collecting ammonia in a receiver containing orthoboric acid solution, titration of the ammonium ion with amidosulfuric acid. Is applicable to nitrogen contents from 0,002 % (m/m) to 0,5 % (m/m); does not apply to samples containing silicon nitride.


General information

  • Status :  Published
    Publication date : 1993-06
  • Edition : 1
    Number of pages : 9
  • :
    ISO/TC 17/SC 1
    Methods of determination of chemical composition
  • 77.080.01
    Ferrous metals in general

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