Registration Dossier
Registration Dossier
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EC number: 231-159-6 | CAS number: 7440-50-8
Categories
- Category name:
- Read-across from copper ions for environmental fate and hazard assessment
Justifications and discussions
- Category definition:
- Read-across from copper ions for environmental fate and hazard assessment
- Category rationale:
- Copper metal (Cu°) is insoluble and needs to be transformed to solubilised (dissolved) species in order to be available to the aquatic environment. Transformation-dissolution tests were conducted according to the GHS protocol (GHS, 6th edition, Annex 10) and have quantified the release of soluble copper ions from metallic copper into environmental media. Cu2+ is thus the most environmental relevant species. It is further recognised that free Cu2+ ions are the most active copper species and cause environmental effects, whereas total Cu concentrations in aqueous media are not directly related to ecological effects (ICPS, 1998). This is further documented in section 4 of the CSR.
The read-across hypothesis is, therefore, that the ecotoxicity of copper is caused by the soluble copper ions. For this reason, it is possible to read-across from ecotoxicity and environmental fate studies conducted with all soluble copper compounds (e.g. CuCl2, CuSO4,...) or with environmental studies reporting concentrations of dissolved copper. These data, together with the transformation-dissolution data of copper metal, can then be used for assessing the environmental hazard and fate of copper metal. Note that the counter-ion should be nontoxic to biota, e.g. studies conducted with cyanide as counter-ion would not be considered for this read-across.
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.
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