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Ecotoxicological information

Toxicity to microorganisms

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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 3hr NOEC for inhibition of activated sludge respiration was determined to be 1000 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

Because data concerning the toxicity of dineodymium tricarbonate to microorganisms was not available, toxicity information for the closely related compound, dicerium tricarbonate, was used to estimate the toxicity.

A limit test was conducted in accordance with the EU Commission Directive 92/69/EEC (C.1, C.2, and C.3) and the OECD Series on Testing and Assessment No. 23 (Guidance Document on Aquatic Toxicity Testing of Difficult Substances and Mixtures, 2000). One concentration of dicerium tricarbonate of nominal 1000 mg/L was used to demonstrate that dicerium tricarbonate has no toxic effect on activated sludge microorganisms up to and including this concentration.

Dicerium tricarbonate had no significant inhibitory effect on the respiration rate of activated sludge after the incubation period of three hours at the limit test concentration of 1000 mg/L. Thus, the 3-hour NOEC of dicerium tricarbonate to activated sludge microorganisms was at the limit of water solubility of dicerium tricarbonate under the test conditions, or at 1000 mg/L.