Astm D 3872 – 86 (Reapproved 1999) pdf free download

Standard Test Method for
Ferrous Iron in Iron Oxides1,2

This standard is issued under the fixed designation D 3872; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method covers the quantitative determination
of ferrous oxide (FeO) by oxidation of ferrous iron (Fe++) in an
the 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

2.1 ASTM Standards:
D 50 Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and
D 280 Test Methods for Hygroscopic Moisture (and Other
Matter Volatile Under the Test Conditions) in Pigments3
D 769 Specification for Black Synthetic Iron Oxide3
D 1193 Specification for Reagent Water4
D 3722 Specification for Natural Red and Brown Iron
Oxide Pigments3
D 3724 Specification for Synthetic Brown Iron Oxide Pigment3

3. Significance and Use

3.1 This test method may be used for production quality
control or specification acceptance.

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