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EC number: 937-221-5 | CAS number: -
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
A weight-of-evidence approach was employed to conclude on the short-term toxicity of the reaction mass of neodymium carbonate and praseodymium carbonate to aquatic invertebrates.
The 48-h EC50 (Daphnia magna) of constituents and analogues was > 100% v/v saturated solution. Hence, the 2 constituents and the 3 analogues are not harmful for the invertebrate species tested (D. magna). As constituents and analogues show similar physico-chemical characteristics (i.e. inorganic solid with no or slight solubility in water), the reaction mass of neodymium carbonate and praseodymium carbonate is thus expected to induce no acute toxicity to aquatic invertebrates.
Key value for chemical safety assessment
Additional information
There was no short-term toxicity study to aquatic invertebrates available on the reaction mass of neodymium carbonate and praseodymium carbonate. However, studies were available on both constituents of the reaction mass as well as on 3 analogues, all showing similar physico-chemical properties (i.e. dineodymium tricarbonate, dipraseodymium tricarbonate, dicerium tricarbonate, neodymium oxide and praseodymium(III,IV oxide). Thus, data on both constituents and analogues were used in a weight of evidence approach to conclude on the acute toxicity potential of the reaction mass to aquatic invertebrates.
Scored as Klimisch 2 (due to read-across) and flagged as weight of evidence, two experimental studies showed that both constituents of the reaction mass induced no alteration of daphnids mobility at the nominal concentration of 100% v/v saturated solution (Goodband T.J. and Mullee D.M., 2010; Harris S., 2012), therefore warranting no classification of both dineodynium tricarbonate (~79%) and dipraseodymium tricarbonate (~21%). As a consequence, the reaction mass of neodymium carbonate and praseodymium carbonate is expected to induce no acute toxicity to aquatic invertebrates and a classification is thus considered unjustified.
These results were further corroborated by three other short-term 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., 2007b, 2008a and 2008b). In these studies performed on daphnids, no alteration of mobility occurred at the nominal 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 |
|
Acute toxicity to aquatic invertebrates (OECD 202, GLP) |
no data |
EC50 > 100% v/v saturated solution |
EC50 > 100% v/v saturated solution |
LL50 > 100 mg/L |
EL50 > 100 mg/L |
EL50 > 100 mg/L |
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