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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

Data from an OECD guideline study 202 on Daphnia magna are available.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
13 mg/L

Additional information

Freshwater invertebrates

In the study performed according to the OECD Guideline 202 (April 13, 2004) the 48h acute toxicity of styrene oxide to Daphnia magna was studied under semi-static conditions. Daphnids were exposed to control, reference control, and test substance for 24 and 48 hours. Initial concentrations at 10, 22, 46 and 100 % of the WSF slightly decreased during the renewal periods (58-89 % of initial). Given these results, effect parameters were based on the average exposure concentrations that were calculated to be 4.3, 11, 20 and 47 mg/L.

Immobilization was observed at test termination. The 48h-EC50 of styrene oxide was 13 mg/L based on average exposure concentrations (95 % confidence interval between 12 and 16 mg/L).

Marine water invertebrates

No data available