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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Studies on adsorption / desorption do not need to be conducted, as based on the physico-chemical properties and its extremely low water solubility, the substances of the "Iron Oxides Category" can be expected to have a low potential for adsorption. 

Key value for chemical safety assessment

Additional information

Iron oxides exist in crystalline form as uncharged, solid substances and no adsorption to suspended solids and sediment is expected. Thus, a waiver is provided for this endpoint.

Due to their high density, iron oxides will be deposited on the ground of environmental waters. The hydrated form of diiron trioxide exists in an amorphous form when being precipitated from iron hydroxide. This form crystallises after ageing and drying. For soluble forms of Iron (III) a mean log Kd of 4.9; 6.6 and 2.7 for sediment, suspended particles and soil, respectively, is reported. Additionally, a log Kd, observed range of 3.97-5.66 for sediment and a log Kd of 4.50 for sediment is reported. Those studies are not reliable or not sufficiently described and are not taken into account for assessment.

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