Significance and Use
This test method may be used for production quality control or specification acceptance.
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 concerns if any, 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D50 Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and Manganese
D280 Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
D769 Specification for Black Synthetic Iron Oxide
D1193 Specification for Reagent Water
D3722 Specification for Natural Red and Brown Iron Oxide Pigments
D3724 Specification for Synthetic Brown Iron Oxide Pigment
ferrous iron content; iron oxides; ferrous iron content; pigment; iron oxides; Black pigments; Brown iron oxide; Ferrous iron content; Iron content--paint driers; Iron oxide pigments--black (natural/synthetic); Iron oxide pigments--brown (natural/synthetic); Natural pigments; Paint pigments--specifications
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Citing ASTM Standards
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