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ISO 7990:1985

Manganese ores and concentrates — Determination of total iron content — Titrimetric method after reduction and sulfosalicylic acid spectrophotometric method

Dec 12, 1985

General information

90.93     Mar 25, 2022

ISO

ISO/TC 132

International Standard

73.060.20  

French   English  

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Published

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Scope

Method A is applicable to products having a total iron content from 1 to 25 % (m/m), and method B is applicable to products having a total iron content from 0.2 to 2 % (m/m). ISO 7990 should be read in conjunction with ISO 4297. Specifies principle, reactions (method A only), reagents, apparatus, sampling and samples, procedure and expression of results.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO/R 313:1963

NOW

PUBLISHED
ISO 7990:1985
90.93 Standard confirmed
Mar 25, 2022

REVISED BY

ABANDON
ISO/WD 7990