Registration Dossier
Registration Dossier
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EC number: 909-701-4 | CAS number: -
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
By analogy with one of its constituent (i.e. cerium dioxide), reaction mass of cerium dioxide and lanthanum oxide and lanthanum fluoride should not show any adverse effect on aquatic micro-organisms.
Key value for chemical safety assessment
Additional information
No data is available on the reaction mass. Based on the physico-chemical, environmental and ecotoxicological data available on both the reaction mass and its constituents, the substances show highly similar intrinsic properties. Therefore, a read-across with constituents when data are not available on the reaction mass appears fully relevant. A reliable experimental test on aquatic micro-organisms, scored as Klimisch 2 and flagged as a key study, is available for cerium dioxide (Grutzner, 2006); revealing no adverse effect. Another study of reliability 2 was also available on cerium dioxide (Park et et al., 2007a) and give consistent results. It was thus selected as a supporting study. These results can be used to conclude on the toxicity of reaction mass of cerium dioxide and lanthanum oxide and lanthanum fluoride to aquatic micro-organisms without launching further tests.
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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