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ISO 10702:1993

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

Jun 24, 1993

General information

90.93     Aug 25, 2023

ISO

ISO/TC 17/SC 1

International Standard

77.080.01  

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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.

Life cycle

NOW

PUBLISHED
ISO 10702:1993
90.93 Standard confirmed
Aug 25, 2023

REVISED BY

ABANDON
ISO/WD 10702