Registration Dossier
Registration Dossier
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EC number: 215-214-1 | CAS number: 1313-97-9
Endpoint summary
Administrative data
Description of key information
Additional information
ENVIRONMENTAL FATE PROPERTIES
Summary of degradation
Neodymium oxide is inorganic and hence the biodegradation tests are not relevant. As this substance is highly insoluble in water, the hydrolysis assay is not relevant as well. Therefore, abiotic and biotic degradation will not occur.
Volatilisation
Data on volatilisation are not available for the substance. Neodymium 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 neodymium oxide but literature data provide information on the soluble salt neodymium nitrate (see Section 5.3.1). A BCF value of 634 was recorded in internal organs after 29 days, with BCF values reducing over time. and reaching 451 by the end of the study at 43 days. For the other studied tissues, the BCF values were the followings:
Muscle: BCF = 0.14 to 0.86
Skeleton: BCF = 0.24 to 2.28
Gills: BCF = 2.94 to 11.2
It is thus important to note the BCF values in internal organs were higher than that reported for other tissues. This was expected considering that the alimentary tract reflects normal transit of the substance. For this reason, this observation cannot be considered as an indication of bioaccumulation. The half-life for internal organs was calculated as 6.30 days. Neodymium nitrate is therefore eliminated from fish and does not readily bio-concentrate. By analogy to neodymium nitrate, neodymium oxide is unlikely to bio-accumulate, and furthermore being poorly water soluble it is expected to be less bioavailable than the soluble salt tested.
Secondary poisoning
Bioaccumulation of neodymium 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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