Registration Dossier
Registration Dossier
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EC number: 231-096-4 | CAS number: 7439-89-6
Water solubility
Administrative data
Link to relevant study record(s)
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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