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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

EC50 (72 h) > 100 mg/l (nominal)

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L

Additional information

Acute toxicity for Green algae (Scenedesmus subspicatus) was evaluated in the 72 hours screening test, according to the OECD guideline 201 on a similar substance within the category of Stilbene Fluorescent Whitening Agents, the analogous dihydroxyethyl derivative tetrasulphoned sodium salt (CAS 16470-24-9). This substances have the same organic functionalities, but a different salification than the CAS 4193-55-9. CAS 16470-24-9 can be considered a conservative representative, since it has the same organic functionalities, but the higher sulphonation let to a higher water solubility, therefore availability in the water compartment. The percentage and chemical identity of organic impurities are also very similar. The Category Justification Report is attached to the section 13 for more details.

A study on a similar substance was chosen as key, because the reported study on the substance under registration in itself was performed in a limit test at 100 mg/l on a 22 % water solution, therefore with a concentration too low to set the correct classification for the substance.

A third study is reported, conducted on another analogous substance of the category, and the results are well consistent.

No aquatic algae toxicity is expected for the substance to be registered.