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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The 48 hour LL50 to Daphnia magna was > 100 mg/L. 
The No Observed Effect Concentration (NOELR) after 48 hours exposure was ≥ 100 mg/L.
The study was read across from dicerium tricarbonate

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
100 mg/L

Additional information

The 48hr-acute toxicity of cerium carbonate to Daphnia magna was studied under static conditions according to the EU Commission Directive 92/69/EEC, Part C.2 (1992) and the OECD Guideline for Testing of Chemicals, N°202 (2004).

The study has been read across from the structurally similar substance dicerium tricarbonate. The substances have similar toxicological and environmental profiles and therefore this read across is considered acceptable. The study has been assigned a reliability score of 2, in accordance with the scheme of Klimisch et. al. (1997).

Daphnids were exposed to control and test chemical at nominal concentration of 100 mg of dry substance /L (loading rate) for 48 hr. Mortality/immobilisation were observed daily. In the control and at the loading rate of 100 mg/L, no immobilised test organisms were observed during the test period of 48 h. Thus, the 48 hour LL50 was > 100 mg/L and the 48h NOELR were >= 100 mg/L.