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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

EC50 48h Daphnia magna > 100 mg/l

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
100 mg/L

Additional information

The acute toxicity to Daphnia magna of the substance under registration (CAS 27344-06-5) was investigated under static exposure conditions over a period of 48 h. No chemical analysis of the test media was conducted. For the evaluation of the test the nominal content of the test solution was used, assuming the test compound to be stable in water over 48 h. No significant effects (< 10 % of a total of 40 individuals) were observed at 10 and 1 mg/l and in the blank control, respectively. Immobilization at 48 h was slightly increased as compared to the effects after 24 h. Based on these immobilization data the nominal median effect concentration (EC50) of the test item to Daphnia magna for 24 and 48 h can be estimated to be >100 mg/l, respectively. The experimentally determined no-effect concentration (NOEC, EC0) was 100 and 10 mg/l after an exposure of 24 and 48 h, respectively (Häner A., 1999).

As supporting results, data from the similar substance CAS 4193-55-9, 70942-01-7 and 16470-24-9 are reported. These analogous are all dihydroxyethylamino derivative disulphonated sodium salt,, disulphonated sodium/potassium salt and tetrasulphonated sodium salt, respectively; their water solubilities are 48.2, 13.45 and 650 g/l, respectively, which are lower and higher than the substance under registration.

For all tested substances a value of EC50 greater than 100 mg/l.