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Diss Factsheets

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

Link to relevant study record(s)

Description of key information

Daphnids were exposed to DDNSA in a semi-static study according to OECD 202 (limit test at 1.0 mg/L, measured 0.053 mg/L). The immobilisation reported in both controls (2/20) and in the test substance group (1/20) is considered not significant and within the validation criteria for the test. The EC50 was assessed as > 0.053 mg/L.
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.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
0.053 mg/L

Additional information

For aquatic toxicity a study on daphnia is available with DDNSA, which shows no effects up to water solubility level. This is also seen in the studies on the analogue DNNSA. The starting point for risk assessment will be the water solubility level