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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 UVCB substance is with high probability acutely not harmful to algae. No toxic effects were observed within the range of water solubility.

Key value for chemical safety assessment

Additional information

In a non-GLP algae growth inhibition test without analytical monitoring but according to OECD guideline 201 with the algae Desmodesmus subspicatus an EC50 (72 h, nominal) > 100 mg/L based on growth rate was determined [BMG Engineering 2006] for EC 270 -128 -1.


impurity Diphenylamine:

The EU assessment report for Diphenylamien reports for green algae (Scenedesmus subspicatus) in a test according to 67/548/EEC, draft 1992 an EC10 of 0.06 mg/L for growth rate. This value is used for the derivation of PNEC aqua.


Additionally, these results are supported by a GLP study carried out with test material containing two main constituents of EC 253 -249 -4 in similar concentrations. These constituents are also structurally similar to EC 270 -128 -1. This test followed the test procedures of the OECD guideline 201and the toxic effects of the WAF of this mixture on Selenastrum carpicornutum were investigated. Based on growth rate an EC50 (72 h, nominal) of 600 mg/l and 870 mg/l (96h, nominal) was measured [TR Wilbury Laboratories Inc. 1997]. 


Based on these two studies on toxicity to algae it can be assumed for UVCB substance EC 270 -128 -1 that the EC50 growth rate is > 100mg/l and the NOEC is > 10mg/L..