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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Link to relevant study record(s)

Description of key information

Key study on acute toxicity to Daphnia (2010): EC50(48h) = 3.2 mg/L
Read-across to the chemically related substance rosin (2002): EL50(48h) (EL=effective loading rate) = 911 mg/L.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
3.2 mg/L

Additional information

The test substance has a very low solubility in water (<0.1 mg/L). The solubility is higher in buffered media like those used for daphnia tests.

In a recent study (2010) the EC50(48h) was 3.2 mg/L, the NOEC(48h) was 0.39 mg/L. The test substance solutions were prepared as WAFs (water accomodated fractions) with separate loading rates for each concentration. WAFs from the highest loading rates of 500.5 and 992 mg/L resulted in actual test substance concentrations of ca. 20.2 mg/L.

In a study performed with WAFs of the chemically related substance rosin the effective loading rate EL50(48h) was 911 mg/L and the no observed effective loading rate NOELr was 750 mg/L. No analytical measurements were made in this study.