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Standard Test Method for Ferrous Iron in Iron Oxides

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Standard Test Method for Ferrous Iron in Iron Oxides


1.1 This test method covers the quantitative determination of ferrous oxide (FeO) by oxidation of ferrous iron (Fe ) in an acid solution to the ferric state (Fe ) and titration with potassium dichromate using diphenylamine as the indicator.

1.2 This test method is applicable to synthetic black iron oxide, natural black iron oxide, magnetite or brown iron oxide where part of the iron content is present in the ferrous state (Note 1). It is applicable to iron oxides where the ferrous iron content ranges from 50 to 0.20%.

Note 1-Natural iron oxides and magnetite may contain traces of metallic iron that will be combined with and analyzed as FeO.

1.3 This standard does not purport to address the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


Brown iron oxide; Ferrous iron content; Iron content-paint driers; Iron oxide black; Iron oxide brown (synthetic); Natural pigments; Pigments-black; Pigments-iron oxide black (natural/synthetic); Pigments-iron oxide brown (natural); iron oxide black (natural)- chemical analysis, test; ICS Number Code 71.060.20 (Oxides); 77.080.10 (Irons)

To find similar documents by ASTM Volume:

06.03 (Paint -- Pigments, Drying Oils, Polymers, Resins, Naval Stores, Cellulosic Esters, and Ink Vehicles)

To find similar documents by classification:

71.060.20 (Oxides Including dioxides, peroxides, etc.)

77.080.10 (Irons)

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Document Number


Revision Level

1986 R99 EDITION



Modification Type


Publication Date

April 25, 1986

Document Type

Test Method

Page Count

3 pages

Committee Number