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ISO/CD 4691

Iron ores — Determination of titanium — Diantipyrylmethane spectrophotometric method

General information

Current stage: 30.99 Effective date: Oct 8, 2025

Originator: ISO

Owner: ISO/TC 102/SC 2

Type: International Standard

Scope

ISO 4691:2009 specifies a spectrophotometric method using diantipyrylmethane for the determination of the mass fraction of titanium in iron ores.
ISO 4691:2009 is applicable to a mass-fraction range of 0,02 % to 4,0 % of titanium in natural iron ores, and iron ore concentrates and agglomerates including sinter products.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 4691:2009

NOW

IN_DEVELOPMENT
ISO/CD 4691
30.99 CD approved for registration as DIS
Oct 8, 2025