Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

 The study  was carried out according to OECD guideline method 201. Growth inhibition of Desmodesmus subspicatus was determined as EC10- and EC50-values for 72 hours exposure.  Also the NOEC-value for the average specific growth rate was calculated. The study was conducted in compliance with Principles of Good Laboratory Practice.

The EC10-value of the test substance was 120.2 mg/l with 95 % confidence interval of 84.7-158.4 mg/l. The EC50-value was 1199 mg/l with 95 % confidence interval of 1078.7-1331.2 mg/l. In addition, the NOEC-value for this substance was <312.5 mg/l. Test results indicate that this substance possesses low toxicity in freshwater.

Key value for chemical safety assessment

EC50 for freshwater algae:
1 199 mg/L
EC10 or NOEC for freshwater algae:
120.2 mg/L

Additional information

Acute toxicity testing of the substance (BETAFIN BP20) on algae (Desmodesmus subspicatus) was conducted in compliance with Principles of Good Laboratory Practice. The study was carried out according to the OECD guideline method 201. The inhibition of growth was used as an endpoint measurement expressed as the logarithmic increase in biomass. The specified growth rate inhibitions after 72 hours exposure were determined, and toxicity was expressed as the EC10- and EC50-values.The EC10-value of the test substance was 120.2 mg/l with 95 % confidence interval of 84.7-158.4 mg/l. The EC50-value was 1199 mg/l with 95 % confidence interval of 1078.7-1331.2 mg/l. In addition, the NOEC-value for the average specific growth rate after 72 h exposure time was calculated by using the software Dunnet v 1.5. The NOEC-value for this substance was <312.5 mg/l.

Aquatic toxicity test result (72 h) to D. subspicatus does not indicate the need for this substance to be classified as hazardous to the aquatic environment.