ISO 7990:1985Published

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

Minerais et concentrés de manganèse — Dosage du fer total — Méthode titrimétrique après réduction et méthode spectrophotométrique à l'acide sulfosalicylique

Abstract / 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

Replaces

ISO/R 313:1963WithdrawnMethods of chemical analysis of manganese ores — Determination of total iron contentRecommendation · Published 1 Jul 1963 · ISO/TC 65

Replaced by

ISO/WD 7990Deleted (project abandoned)Manganese ores and concentrates — Determination of total iron content — Titrimetric method after reduction and sulfosalicylic acid spectrophotometric methodInternational Standard · ISO/TC 65