Registration Dossier
Registration Dossier
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EC number: 937-221-5 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The 72-h EL50 (Freshwater algae: Pseudokirchneriella subcapitata) of the reaction mass of neodymium carbonate and praseodymium carbonate was > 160 mg/L based on the growth rate. Hence, the reaction mass of neodymium carbonate and praseodymium carbonate is not harmful for the algal species tested.
Key value for chemical safety assessment
Additional information
One experimental study, scored as Klimisch 1 and selected as key study, showed that the reaction mass of neodymium carbonate and praseodymium carbonate was not harmful to the algal species tested (Vryenhoef H., 2013), therefore warranting no classification.
This result was further corroborated by three other toxicity studies, scored as Klimisch 2 (due to read-across) and flagged as supporting study, on analogues of the reaction mass: dicerium tricarbonate, neodymium oxide, and praseodymium(III,IV) oxide (Bätscher R., 2007c; Peither R., 2009a, 2009b and 2009c). In these studies performed on algae, 72-h EL50 (based on growth rate) were systematically greater than the loading rate of 100 mg/L.
Reaction mass of neodymium carbonate and praseodymium carbonate |
Dineodymium tricarbonate |
Dipraseodymium tricarbonate |
Dicerium tricarbonate |
Neodymium oxide |
Praseodymium(III,IV) oxide |
|
Toxicity to aquatic algae - EL50 (OECD 201, GLP) |
> 160 mg/L |
no data |
no data |
> 100 mg/L |
> 100 mg/L |
> 100 mg/L |
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