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ISO 10702:1993

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

Standard Details

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
Standard Type: Main
Document No: ISO 10702:1993
Document Year: 1993
Pages: 9
Edition: 1
  • Section Volume:
  • ISO/TC 17/SC 1. Methods of determination of chemical composition

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ISO 10702:1993
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