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Diss Factsheets
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EC number: 208-655-6 | CAS number: 537-01-9
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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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