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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 96 hr EC50 range for the toxicity to aquatic algae, obtained from a single reliable experimental study, was 22 - >100 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
22 mg/L

Additional information

Bentley et al (1976) tested the toxicity of dicyclopentadiene to three species of algae. The range of EC50 values reported within the paper was between 22 - >100 mg/L. The study followed a method similar to standard guidelines but did not include analytical confirmation of the exposure concentrations.

The OECD SIDS identified an Environmental Agency Japan test which showed the 72 hour EC50 to be 27 mg/L and the NOEC to be 18 mg/L. This study was unavailable for review but is included here as part of a weight of evidence approach together with the Bentley studies.

A QSAR result has also been included as part of the weight of evidence, which used the ECOSAR program to derive a 96 hour EC50 of 5.1 mg/L and a ChV of 2.4 mg/L, which corresponds to a NOEC value of 1.7 mg/L (calculated by ChV ÷v2 as ChV is geometric mean of NOEC and LOEC).