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EC number: 310-013-6 | CAS number: 102110-15-6 A complex combination of hydrocarbons obtained by distillation of the products from a steam-cracking process. It consists predominantly of hydrocarbons having carbon numbers of C5 and dicyclopentadiene and boiling in the range of approximately 30°C to 170°C (86°F to 338°F).
Short term toxicity to fish data are available for 2 streams within this Category. The 96 hour LC50s ranged from 0.58 - 13.5 mg/L. The 96 hour LL50 range based on two studies was 0.73 - 6.3 mg/L.
CAS No 68478-10-4 (ACC, 2004c): This is a GLP compliant, guideline study. After Oncorhynchus mykiss were exposed to WAFs prepared from Dicyclopentadiene/Codimer Concentrate for 96 hours, the LL50 was 0.73 mg/L and the LC50 was 0.58 mg/L.
CAS No 68477-54-3 (ACC, 2004d): This is a GLP compliant, guideline study. The LC50 of Low DCPD Resin Oil (MRD-03-630) was determined to be 6.1 mg/L and the LL50 was 6.3 mg/L after 96 hours of exposure.
CAS No 68477-54-3 (Sabic, 1989b): This is a GLP compliant, guideline study and is considered adequate for assessment. The 48 and 96 hour LC50 toxicity of C9-Resin feed to Brachydanio rerio was determined as 13.5 mg/L. After 96 hours of exposure, all animals were alive at 10 mg/L but total mortality was observed at 18 mg/L. After 96 hours of exposure, the NOEC was determined as 5.6 mg/L (mortality and condition) based on nominal concentrations.
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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