Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

ENVIRONMENTAL FATE PROPERTIES

Summary of degradation

Cerium oxalate is inorganic and hence the ready biodegradation and hydrolysis tests are not relevant. Abiotic and biotic degradation will not occur.

Volatilisation

Data on volatilisation are not available for the substance. Cerium oxalate is a solid and hence not volatile.

Distribution modelling

No distribution modelling data exist. Modelling is not applicable to an inorganic substance such as this.

Summary of environmental distribution

Read across data are available for cerium carbonate.

Adsorption: The Kd values amounted to 11784, 59264 and >100843 mL/g for soils I to III, respectively, with corresponding Koc values of 499332, 5986256 and >5335623 mL/g, respectively. Desorption: The Kd des values were 10147, 102180, > 225268 mL/g for soils I to III, respectively, with corresponding Koc des of 429968, 10321193 and >11918936 mL/g respectively

Summary and discussion of bioaccumulation

No bioaccumulation data are available on insoluble salts of cerium but literature data provide information on the soluble salt cerium nitrate. A BCF value of 804 was recorded after 29 days, with BCF values reducing over time. The half-life for internal organs was calculated as 8.66 days. Cerium nitrate is therefore eliminated from fish and does not readily bio-concentrate. By analogy to cerium nitrate, cerium oxalate is unlikely to bioaccumulate, and furthermore being poorly water soluble it is expected to be less bioavailable than the soluble salt tested.

Secondary poisoning

Bioaccumulation of cerium oxalate is not expected to occur. Hence no secondary poisoning risk exists.

Assessment of PBT/vPvB Properties - Comparison with the Criteria of Annex XIII

According to the Guidance on information requirements and chemical safety assessment, Chapter R.11: PBT assessment, “the PBT and vPVB criteria of Annex XIII to the regulation do not apply to inorganic substances”. Therefore the substance is not considered to require any further assessment of PBT properties.