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Acute toxicity data are available for fish, Daphnia and algae. The data for fish and algae are from studies conducted with the similar substance cerium carbonate. In a semi-static 96-hour study in accordance with OECD 203, no mortality was observed and the 96-h EC50 of dicerium tricarbonate was >100 mg/L. The NOEC was therefore ≥100 mg dicerium tricarbonate /L. A standard static limit test (OECD 202) investigating the toxicity of dineodymium tricarbonate to Daphnia magna was conducted. No effects were observed and, based on mean measured concentrations, the 48-h EC50 was >0.013 mg/L and the corresponding NOEC ≥0.013 µg/L. The toxicity of dicerium tricarbonate to green algae (Scenedesmus subspicatus) was investigated in an OECD 201 guideline study. The test compound had an inhibitory effect at 50 mg/L. Consequently the 72-h NOEC was 25 mg/L, whereas the EC50 was >100 mg/L.

In a 21-day OECD 211 guideline study the chronic toxicity of the similar substance dicerium tricarbonate to Daphnia magna was investigated. The NOEC was reported as ≥100 mg/L.

No effects on sewage sludge were observed in a standard 3hr study conducted with the closely related compound dicerium tricarbonate. Dicerium tricarbonate had no significant inhibitory effect on the respiration rate of activated sludge at the limit test concentration of 1000 mg/L. Hence the NOEC for dineodymium tricarbonate is also proposed as 1000 mg/L.