ISO 10702:1993
Steel and iron; determination of nitrogen content; titrimetric method after distillation
- Standard No.
- ISO 10702:1993
- Release Date
- 1993
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 10702:1993
- Scope
- 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.
ISO 10702:1993 history
- 1993 ISO 10702:1993 Steel and iron; determination of nitrogen content; titrimetric method after distillation
