ISO 10702:1993
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ISO 10702:1993
18791

Abstract

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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 

  •  :  Published
     : 1993-07
  •  : 1
     : 9
  •  : ISO/TC 17/SC 1 Methods of determination of chemical composition
  •  :
    77.080.01 Ferrous metals in general

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