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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

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L

Additional information

One test was performed on the substance under registration (CAS 16324-27-9) (Ciba-Geigy Ltd., 1996), according to the OECD guideline 201. At the nominal concentration tested of 100 mg/l no effects observed, nevertheless the sample concentration is about 32 %.

The substance is part of the Stilbene Fluorescent Whitening Agents category, group 3. The most similar substance can be considered CAS 16470-24-9, the dihydroxyethylamino derivative tetrasulphonated sodium salt. Both substances share the same metabolic and degradation pathway, while the dihydroxy derivative is more water soluble and can also be considered a conservative reference (650 g/l for CAS 16470-24-9 vs 140 g/l for CAS 16324-27-9).

Acute toxicity for Green algae was evaluated in two 72 hours tests, according to the OECD guideline 201, performed on the tetrasulphonated dihydroxyethylamino representative: in both the EC50 was recorded as higher than 1000 mg/l (RCC Umweltchemie AG., 1990 and Solvias AG., 1999).

In conclusion, no aquatic algae toxicity is expected for the substance under registration.