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Short-term toxicity to aquatic invertebrates

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Description of key information

Short term toxicity to aquatic invertebrates data are available for 2 streams within this Category. The 48 hour EC50 ranged from 0.76 - 2.9 mg/L with the

EL50 ranging from 0.91 - 3.2 mg/L (WAF). One study provided a 96 hour LC50 for a marine invertebrates of 1.4 mg/L.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
0.91 mg/L
EC50/LC50 for marine water invertebrates:
1.4 mg/L

Additional information

CAS No 68478-10-4 (ACC, 2004e): This is a GLP compliant, guideline study considered adequate for assessment. After Daphnia magna were exposed to WAFs prepared from Dicyclopentadiene/Codimer Concentrate for 48 hours, the EL50 was 0.91 mg/L and the EC50 was 0.76 mg/L.

CAS No 68477-54-3 (ACC, 2004f): This is a GLP compliant, guideline study considered adequate for assessment. The 48 hour EL50 was 3.2 mg/L and the EC50 was 2.9 mg/L (WAF).

CAS No 68477-54-3 (Sabic, 1987a): This is a GLP compliant, equivalent to guideline study. The study was a marine study and no replicates were mentioned. The 96 hour LC50 was 1.4 mg/L and the 96 hour NOEC was 1.0 mg/L.

The authors report results based on nominal loading rates (WAF) and mean measured concentrations. As the test substance is a hydrocarbon stream with various components reporting a measured concentration could be misleading as the measured concentration does not relate to a concentration of the raw stream. Instead, we have used the results reported as WAF, which better represent the potential toxicity of the test substance.