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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

Toxicity to aquatic algae data are available for 5 streams within this Category. On the basis of loading rates, the 72 hour ErL10 ranged 1.3 -1.7 mg/L (WAF) and the ErL50 ranged from 1.6 to 6.3 mg/l.

The 96 hour ErL50 ranged 1.4 - 1.5 mg/L (WAF). On the basis of measured concentrations, the 72 hour NOEC ranged 0.30-0.37 mg/L and the 96 hour NOEC ranged 0.30 - 0.94 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
1.3 mg/L
EC10 or NOEC for freshwater algae:
0.46 mg/L

Additional information

CAS No 68478-10-4 (ACC, 2004g): This is a GLP compliant guideline study considered adequate for assessment. The effects on growth rate (r) based upon actual loading rates for Dicyclopentadiene/Codimer Concentrate (DCPD/Codimer Concentrate) give a 72 hour ErL50 of 1.3 mg/L (WAF), a 96 hour ErL50 of 1.4 mg/L (WAF) and 72 and 96 hour NOELR of 0.47 mg/L (WAF). On the basis of measured concentrations, the 72 and 96 hour NOEC is 0.30 mg/L.

CAS No 68477-54-3 (ACC, 2004h): This is a GLP compliant, guideline study considered adequate for assessment. The effects on growth rate (r) based upon actual loading rates for Low Dicyclopentadiene Resin Oil (Low DCPD Resin Oil) gave a 72 and 96 hour ErL50 of 1.5 mg/L (WAF), a 72 hour NOELR of 0.46 mg/L (WAF) and a 96 hour NOELR of 1.1 mg/L (WAF). On the basis of measured concentrations, the 72 hour NOEC is 0.37 mg/L and the 96 hour NOEC is 0.94 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.