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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

The growth inhibition on the freshwater algae Scenedesmus subspicatus was tested by Hüls AG, Marl (1992) in a 72-h test (under static conditions in accordance with EU Method C3). 6 concentrations (5 replicates each) plus controls (8 replicates) were tested. No growth inhibition (neither biomass nor growth rate) was observed at any treatment level. 

Key value for chemical safety assessment

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

Additional information

The study (with use of EU Method C.3, Algal Inhibition test) was conducted according to appropriate guidelines and meets scientifically accepted principles. However, the study does not reveal any test item related effects reducing the validity of the study. All endpoints were found to be >2.2 mg/L (LOEC, EC50, EC10) or >= 2.2 mg/L (NOEC). The selected concentration range relates to the low water solubility of the test substance. There is only limited scope to improve the solubility of decahydronaphthalene. Thus, the given results can be considered as acceptable.


 


The results are summarised in the following table:

















 MethodEndpoint (exposure duration)Exposure concentration Reference
EU Method C.3 (Algal Inhibition test)   EC50(72 h)> 2.2 mg/L  Hüls AG, Marl (1992)

The available study indicates that decahydronapthalene concentration of 2.2 mg/L is not toxic to algae and should be used for the risk assessment.