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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The calculated freshwater algae 72-hour EC50 for 1,3-butadiene is 33 mg/l.

Key value for chemical safety assessment

Additional information

Two QSAR models have been used to give an indication of the toxicity of 1,3-butadiene to algae. The calculated 96 hour EC50 values are 33 mg/l from the equation recommended in the TGD (Verhaar et al, 1995) and 11mg/l from ECOSAR (Nabholz and Mayo-Bean, 2009). Values from the TGD will be used for consistency with the EU RAR for 1,3-butadiene.