Lithium (C8-C10, branched, C9 rich, alkylnaphthalene sulphonate)

Short-term toxicity to aquatic invertebrates

Description of key information

The acute toxicity of the test substance in daphnia resulted an EC50 value of > 0.42 mg/L

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

0.42 mg/L

Additional information

Daphnids were tested in a semi-static study according to OECD 202 at test concentrations of 0.5, 0.9, 1.6, 2.8 and 5.0 mg/L (measured 18, 45, 91, 183 and 418 ug/L (as geometric mean)). No immobility was observed in any of the test solutions and controls. The EC50 was calculated to be > 0.42 mg/L (Laus 2014).

For Daphnia magna exposed to DNNSA the 48h-EC50 was beyond the range tested, i.e. exceeded the average exposure concentration of 0.27 mg/l. 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.

BaDNNSA did not induce acute immobilisation of Daphnia magnaat an initially measured concentration of 0.18 mg/l after 48 hours of exposure (NOEC). 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.

Based on the similarity of the results found, the read-across from DNNSA for daphnia toxicity is considered appropriate and therefore also for algae a read-across approach can be taken.