Registration Dossier
Registration Dossier
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EC number: 208-655-6 | CAS number: 537-01-9
Endpoint summary
Administrative data
Description of key information
Additional information
Hydrolysis:
Due to technical limit in order to determine the different form of cerium in solution (especially carbonate and oxids), hydrolysis assay can be waived.
Biodegradation:
Due to the inorganic nature of dicerium tricarbonate, biodegradation studies can be waived (Column 2 of REACH Annex VII).
Bioaccumulation:
A weight-of-evidence approach was carried out to assess the bioaccumulation potential of dicerium tricarbonate. Data on soluble cerium salts, and evidences showing that soluble and insoluble forms of a same rare earth present similar bioaccumulation properties, were used to conclude. In this context, by analogy with soluble salts of cerium, it is expected that dicerium tricarbonate should not show any potential for bioaccumulation.
The detailed results already published, which clearly state on the transformation of the cerium carbonate in the environment and the absence of accumulation of cerium in sediment biota and fish indicate there is no scientific justification to propose other test on the bioaccumulation in sediment.
Adsorption/desorption:
Adsorption/desorption tests allow to determine a distribution coefficient, which is the ratio of equilibrium concentrations of a dissolved substance in a two-phase system consisting of a sorbent (typically soil or sewage sludge) and an aqueous phase. Hence, suitable methods must be available to determine the substance concentration in both phases. In a first step, the HPLC method (OECD 121, EU C19) may be used as a screening. However, such a method is not suitable for inorganic compounds as dicerium tricarbonate. Batch equilibrium method (OECD 106, EU C18) may be considered in a more definitive step.Initially, a preliminary test was performed in order to investigate the adsorption behaviour of dicerium tricarbonate. For this purpose, three soils (dry weight) to aqueous phase ratios: 1/50 (1 g/50 mL), 1/25 (1 g/25 mL) and 1/5 (5 g/25 mL) were used. Very high adsorption was observed for all three ratios. After 48 hours of agitation, virtually all of the initial amount of test item was adsorbed (>99%).
Only low desorption was observed during the 48-hour desorption period (maximum of 2% of test item desorbed for all three soils).
The mass balance was performed during the screening test at the soil to solution ratio of 1/50. Most of the applied amount was extracted from the soils, with only <0.4% of applied detected in the supernatants. The mass balance results confirmed the strong adsorption of dicerium tricarbonate to soil.
The following adsorption/desorption distribution coefficients were obtained for the soils at the selected ratio of 1/50:
- Mean Koc value: 3940404
- Mean Koc, des value: 7556699
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