Registration Dossier
Registration Dossier
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EC number: 430-010-4 | CAS number: 12160-44-0
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
Significant accumulation in organisms is not to be expected.
Key value for chemical safety assessment
Additional information
According to the REACH Regulation Annex IX, column 2 adaptation, the study does not need to be conducted if the substance has a low potential for bioaccumulation. Potassium iron oxide is neither soluble in octanol nor in water. Thus, it is reasonable to expect that the substance does not accumulate in organisms.
Additionally, experimental data on the water solubility and hydrolyzing properties of the test substance revealed that hydrolysis of potassium ferrite - which proceeds just to a minor degree - results in small amounts of potassium hydroxide (KOH). Iron compounds could not be detected. However, examination of the structure of potassium ferrite indicates that the likely form of the hydrolysis of the compound would be the conversion of the ferrite to the also relatively insoluble iron oxide:
Fe22O34-+ H2O --> 11 Fe2O3+ 2 OH-
In spite of the fact that hydrolysis is unlikely to be a significant pathway for the breakdown of potassium ferrite, the bioaccumulation potential of KOH and Fe2O3 has been further examined.
KOH is a strong alkaline substance that dissociates completely in water to K+and OH-. Considering its high water solubility, potassium hydroxide is not expected to accumulate in organisms.
The bioaccumulation potential of diiron trioxide has been examined within the context of the iron category assessment on the Iron Platform / ARCHE (2010). The iron category members are highly insoluble in water, out of toxic response to aquatic organisms, and based upon their physico-chemical properties do not bind to biological ligands. Thus, diiron trioxide is not expected to accumulate in organisms.
Conclusively it can be stated that neither potassium iron oxide nor its degradation products are expected to significantly accumulate in organisms.
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