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EC number: 231-843-4
CAS number: 7758-94-3
This endpoint is covered by the category approach for soluble iron salts
(please see the section for physical and chemical properties for the
category justification/report format). Testing for this endpoint has
been waived in accordance with column 2 restrictions. In addition a
study is considered scientifically unjustified. The overall dissociation
constant is not relevant and the environmental fate assessment bases on
rapidly formed transformation products. The behaviour of iron ions in
solution is dependent on the conditions. Key influences include oxygen
content, pH and the presence of potential ligand anions with which the
cationic iron might associate. When the ferric ion is resulting from
oxidation of the ferrous ion or directly released to water the hexa-aquo
Kation is formed. This is strongly acidic with a pKa of 3.05 (Cotton &
Wilkinson 1972). Thus:
[Fe(H2O)6]3+ -> [Fe(H2O)6](OH)2+ + H+(aq)
Nonetheless the Fe-hexa-aquo-kation is only minor species due its
limited solubility, short half-life, finally precipitation and
eventually polymerisation in the environment.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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