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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

Two studies on algae toxicity were carried out according to EU Method C.3 and OECD Guideline 201 (Method: DIN 38412 L9, Algae Inhibition Test). Both studies were considered reliable with restrictions. The key study is well documented, including details on the test item, method and evaluation. Further, all raw data is included. The supporting study is less well documented. The study report does not include any details on the test material, only minimum information on the method used and no information on evaluation. Therefore, the selected key study is considered more reliable and results are used in hazard assessment.
In the key study Scenedesmus subspicatus was exposed for 72 h and 96 h to static concentrations of 0, 10, 25, 50 and 100 mg/L test item. The no-observed-effect concentration (NOEC) for growth rate and biomass was 25 mg/L. The 72 h 10 % effect concentrations for mean biomass (EbC10) and average specific growth rate (ErC10) respectively were found to be 29.6 mg/L (95 % confidence limits of 14.3 and 61.5 mg/L) and 38.18 mg/L (95 % confidence limits of 2.6 and 559.3 mg/L). The 72 h 50 % effect concentrations for mean biomass (EbC50) and average specific growth rate (ErC50) respectively were found to be 90.0 mg/L (95 % confidence limits of 29.7 and 272.5 mg/L) and 105.7 mg/L (95 % confidence limits of 1.9 and > 500 mg/L).
In the supporting study Scenedesmus subspicatus was exposed for 72 h and 96 h to static concentrations of 0, 10, 25, 50 and 100 mg/L test item. The 72 h 10 % effect concentrations for mean biomass (EbC10) and average specific growth rate (ErC10) respectively were found to be 4.3 mg/L (95 % confidence limits of 3.5 and 5.1 mg/L) and 12.1 mg/L (95 % confidence limits of 3.1 and 47.2 mg/L). The 72 h 50 % effect concentrations for mean biomass (EbC50) and average specific growth rate (ErC50) respectively were found to be 59.0 mg/L (95 % confidence limits of 37.3 and 93.3 mg/L) and 37.4 mg/L (95 % confidence limits of 4.1 and 338.9 mg/L).

Key value for chemical safety assessment

EC50 for freshwater algae:
105.7 mg/L
EC10 or NOEC for freshwater algae:
38.2 mg/L

Additional information