Naphtha (petroleum), light steam-cracked, debenzenized, C8-16-cycloalkadiene conc.

Short-term toxicity to aquatic invertebrates

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.