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.
| SDO | ISO: International Organization for Standardization |
| Document Number | ISO 10702 |
| Publication Date | Not Available |
| Language | en - English |
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| Supercedes | |
| Committee | ISO TC 17/SC 1 |
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