Iron(III) oxide-hydroxide
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A number of species are dubbed iron(III) oxide-hydroxide. These chemicals are oxide-hydroxides of iron, and may occur in anhydrous (FeO(OH)) or hydrated (FeO(OH)·nH2O) forms. The monohydrate (FeO(OH)·H2O) might otherwise be described as iron(III) hydroxide (Fe(OH)3), and is also known as hydrated iron oxide or yellow iron oxide.
Iron(III) hydroxide occurs naturally as the minerals goethite (CAS number[]), akaganéite, lepidocrocite and feroxyhyte, as well as siderogel and limonite.
Yellow iron oxide (CAS []) is used as a pigment, eg. Pigment Yellow 42 or C.I. 77492. Pigment Yellow 42 is Food and Drug Administration (FDA) approved for use in cosmetics and is used in some tattoo inks. Solid material color ranges from yellow through dark brown to black. Its risk and safety phrases are R36 R37 R38 S26 S36.
Iron oxide-hydroxide is used in aquarium water treatment as a phosphate binder. [1]
[edit] See also
- Iron pillar of Delhi
- bernalite
[edit] External links
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