ISO-10702 › Steel and iron - Determination of nitrogen content - Titrimetric method after distillation

ISO-10702 - 1ST EDITION - CURRENT


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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.

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Document Number

ISO 10702:1993

Revision Level

1ST EDITION

Status

Current

Publication Date

July 1, 1993

Committee Number

ISO TC 17/SC 1