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Short-term toxicity to aquatic invertebrates

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Description of key information

48 h-NOEC = 32 mg/L, nominal (Daphnia magna; OECD guideline 202 (2004), GLP, RL1)

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
32 mg/L

Additional information

The 48 hr acute toxicity of Epoxy half acrylate (100% a.i.) to Daphnia magna was studied under static conditions.  Daphnids were exposed to control and test chemical at nominal concentrations of 0 (control), 10, 18, 32, 56 and 100 mg/L, corresponding to measured concentrations of 0, 6.4, 5.92, 5.48, 6.94 and 4.57 mg/L. Due to the low water solubility the correlation between nominal and measured concentration was very poor. At the end of the test the measured values were higher than at the beginning of the test (except of the treatment 32 mg/L). This was probably caused by dissolved excrements of the daphnia as it can be seen in the control. Therefore, the nominal concentrations were used for the determination of the biological results.

Mortality/immobilisation and sublethal effects were observed daily. Two concentrations showed toxicity between 0 and 100% immobilisation. None of the animals were immobilised in the control.

The 24 h-EC50 of potassium dichromate was tested in a current positive control test. The value was determined as 1.1 mg/L, lying within the demanded range of 0.6 – 1.7 mg/L.

The 48 hour EC50 of Epoxy half acrylate was determined to be 55 mg/L (nominal).