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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The 96 hour LL50 to Oncorhynchus mykiss was > 100 mg/L. 
The No Observed Effect Concentration (NOELR) after 96 hours exposure was ≥ 100 mg/L.
The study was read across from dicerium tricarbonate

Key value for chemical safety assessment

LC50 for freshwater fish:
100 mg/L

Additional information

The acute toxicity of the test item, dicerium tricarbonate, to rainbow trout (Oncorhynchus mykiss) was determined in a 96-hour semi-static test with a daily test medium renewal according to the EU Commission Directive 92/69/EEC, Part C.1 (1992), and the OECD Guideline for Testing of Chemicals No. 203 (1992).

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).

Fish were exposed to control and test chemical at a loading rate of 100 mg/L for 96h. Mortality and visible abnormalities were observed daily. No mortality or other visible abnormalities were observed during the test.

The 96-hour NOELR and the 96-hour LL50 of dicerium tricarbonate to rainbow trout were thus determined to be > 100 mg/L (measured test item concentration of 5.6 µg/L).

In conclusion, the test item dicerium tricarbonate had no acute toxic effects on rainbow trout up to the solubility limit in the test water, at the loading rate of 100 mg/L.