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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Daphnids were exposed to zinc bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) in a semi-static study according to OECD 202 at test concentrations of 1.0, 1.8, 3.2, 5.6 and 10 mg/L (measured <10% of nominal)(Laus 2014). No immobility was observed in any of the test solutions and controls. The EC50 was > 0.20 mg/L (measured geometric mean).
For Daphnia magna exposed to di C8-C10, branched, C9 rich, alkylnaphthalene sulphonic acid (DNNSA) the 48h-EC50 was beyond the range tested, i.e. exceeded the average exposure concentration of 0.27 mg/l (Wil 2013). Due to the very low solubility of di C8-C10, branched, C9 rich, alkylnaphthalene sulphonic acid (DNNSA) in test medium, concentrations that might be toxic to Daphnia magna could not be reached. The effects observed at the higher measured concentrations of the test substance were mechanical rather than toxic.
Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) did not induce acute immobilisation of Daphnia magna at an initially measured concentration of 0.18 mg/l after 48 hours of exposure (NOEC) (Wil 2013). The 48h-EC50was beyond the range tested, i.e. exceeded the initially measured concentration of 0.18 mg/l. Due to the very low solubility of Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) in water, concentration levels that might be toxic for algae could not be reached.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
0.2 mg/L

Additional information

For aquatic toxicity a study on daphnia is available with ZnDNNSA, which shows no effects up to water solubility level. This is also seen in the studies on the analogues DNNSA and BaDNNSA.