ISO 10702:1993

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

Publication date: Jun 24, 1993

General information

Current stage: 90.60 Effective date: Dec 3, 2022

Originator: ISO

Owner: ISO/TC 17/SC 1

Type: International Standard

ICS: 77.080.01

Languages: French English

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Status: Published

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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
90.60 Close of review
Dec 3, 2022

REVISED BY

ABANDON
ISO/WD 10702

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