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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

A reliable GLP-conform study (Klimisch 1) according to the OECD 201 guideline is available for the effect of the water-accommodated fraction of bismuth subnitrate (Bi5O(OH)9(NO3)4) after seven days equilibration on the biomass and growth rate of the alga Pseudokirchneriella subcapitata (Egeler and Kiefer, 2010). No statistically significant differences were found for the parameters growth rate and biomass yield between the control and the test item concentrations up to the water-accommodated fraction at a loading rate of 100 mg Bi/L and the EC50 (72 h) was determined to be higher than the highest tested concentration. The results of the study demonstrate that the no-observed effect concentration (NOEC) at p ≤ 0.05 for Pseudokirchneriella subcapitata for the parameters yield and growth rate is also ≥ the water-accommodated fraction at a loading rate of 100 mg Bi/L (nominal concentration), corresponding to ≥ a measured dissolved Bi concentration of 0.046 mg Bi/L.

No data are available for the toxicity of bismuth to marine algae.