Registration Dossier
Registration Dossier
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EC number: 234-857-9 | CAS number: 12037-29-5
Endpoint summary
Administrative data
Description of key information
Additional information
ENVIRONMENTAL FATE PROPERTIES
Summary of degradation
Praseodymium oxide 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. Praseodymium oxide is a high melting point solid. Its vapour pressure is thus negligible and this metallic oxide is hence not volatile.
Distribution modelling
No distribution modelling data exist. Current modelling tools are not applicable to an inorganic substance such as this.
Summary of environmental distribution (adsorption/desorption)
Read across data are available for lanthanum oxide. An adsorption / desorption study has been conducted in 3 soils following the OECD 106 guideline. Kd values were 5451 to 216905 ml/g and Kocs were 230978 to 11476472 ml/g (mean 5480283 ml/g).
Read across data are also 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 praseodymium but literature data provide information on the soluble salt praseodymium nitrate. A BCF value of 750 was recorded after 29 days, with BCF values reducing over time. The half-life for internal organs was calculated as 8.66 days. Praseodymium nitrate is therefore eliminated from fish and does not readily bio-concentrate. By analogy to praseodymium nitrate, praseodymium oxide 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 praseodymium oxide 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.
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