Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

ENVIRONMENTAL FATE PROPERTIES

Summary of degradation

Cerium fluoride is inorganic and hence the 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 fluoride is a solid and hence not volatile.

Distribution modelling

No distribution modelling data exist. Current modelling techniques are not applicable to an inorganic substance such as this.

Summary of environmental distribution

Read across data are available for cerium carbonate. An adsorption / desorption study has been conducted in 3 soils following the OECD 106 guideline. Kd values were 11784 to >100843 ml/g and Kocs were 499332 to 5986256 ml/g (mean 3940404 ml/g).

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 fluoride is unlikely to bioaccumulate

Secondary poisoning

Bioaccumulation of cerium fluoride 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.