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Physical & Chemical properties

Water solubility

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Description of key information

Iron powder is insoluble at 22°C. Metallic iron  rapidly oxidizes to form Fe(II), then Fe(II) slowly oxidizes to Fe(III) which finally precipitates in Fe(OH)3 (rust red iron oxide)

Key value for chemical safety assessment

Water solubility:
0.015 mg/L
at the temperature of:
22 °C

Additional information

Iron will not dissolve in water or dilute aqueous solutions of electrolytes, it is oxidized by (aerated) water but forms mainly insoluble oxides.

A seven day transformation/dissolution test according to the OECD guidilen 29 and the GHS (Annex 10) protocol was run on iron powder at a mass loading of 100 mg/l and a pH of 6.0. Under the conditions of this test, the dissolution of Fe is 19.4 µg/L for the 7 -day endpoint.

Chemical equilibrium modelling (ETAP, 2010) was carried out to calculate a solubility limit for iron using iron (III). Solubility limits of 0.015, 0.0024 and 0.00001 mg/L were calculated at pH 6, 7, and 8, respectively.

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