Registration Dossier
Registration Dossier
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EC number: 270-790-1 | CAS number: 68478-10-4 A complex combination of hydrocarbons obtained by the distillation of debenzenized light steam-cracked naphtha. It consists predominantly of cyclic olefinic and aromatic hydrocarbons having carbon numbers predominantly in the range of C8 through C16 and boiling in the range of approximately 130°C to 300°C (226°F to 572°F).
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
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
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 0.91 mg/L
Marine water invertebrates
Marine water invertebrates
- Effect concentration:
- 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.
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