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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

Toxicity of dineodymium tricarbonate was approximated using data available for the closely related compound, dicerium tricarbonate. The chronic NOEC value (reproduction and survival) for Daphnia magna exposed to dicerium tricarbonate was determined to be 100 mg/L.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater invertebrates:
100 mg/L

Additional information

Because data concerning the long-term toxicity of dineodymium tricarbonate to aquatic invertebrates is not available, the toxicity of a closely related compouind, dicerium tricarbonate, has been used as an estimation of toxicity.

OECD guideline 211 and EU C.20 guidelines were followed to test the long-term effect of dicerium tricarbonate exposure on Daphnia magna survival and reproduction. A solution of the dicerium tricarbonate was prepared at a nominal concentration of 130 mg/L (or 100 mg/L after correcting for test material water content); Daphnia were exposed to this concentration, and to 1:3.2, 1:10, 1:32, and 1:100 dilutions of the solution, as well as to a water-only control. The survival and reproductive output were measured and recorded as endpoints.

Dicerium tricarbonate had no statistically significant effect on the mortality or reproduction of Daphnia following an exposure period of 21 days, even at the highest concentration tested (130 mg/L). Thus, the NOELR was determined to be 130 mg/L (or 100 mg/L after correcting for test material water content).