Dineodymium tricarbonate

Toxicity to aquatic algae and cyanobacteria

Description of key information

The toxicity of dineodymium tricarbonate to green algae was estimated via a data read across from dicerium tricarbonate. The dicerium tricarbonate 72-hr NOELR was determined to be 25 mg/L; the 72-hr EL50 was greater than 100 mg/L.  

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:

25 mg/L

Additional information

Toxicity of dineodymium tricarbonate to green algae was estimated using data from a similar substance, dicerium tricarbonate. The toxicity of analog substance dicerium tricarbonate to green algae Scenedesmus subspicatus was determined using serial dilutions of a 100 mg/L test item loading rate solution (1:2, 1:4, 1:8, 1:16, and 1:32). Bioassays were conducted according to EU C.3 (1992) and OECD 201 (2006) guidelines.

Dicerium tricarbonate had a statistically significant inhibitory effect on the growth of Scenedesmus subspicatus after the test period of 72 h first at the loading rate of 50mg/L. Thus, the 72h-NOELR was determined to be the loading rate of 25 mg/L. By constrast, the 72h-EL50 was > 100 mg/L.