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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Two acute studies have been conducted on diisopropylbenzene.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
0.392 mg/L

Additional information

A 48 hour acute study with Daphnia magna was conducted with the mixed isomers (meta and para) of diisopropylbenze (DIPB) under semi-static conditions. The test solutions were prepared using a solvent carrier with nominal concentrations ranging from 0.2 to 2.0 mg/l which all exceeded the water solubility of the substance. The test resulted in a EC50 of 0.392 mg/L and a LC0 of 0.246 mg/L based upon mean measured concentrations. Another 48 hour Daphnia magna acute study was conducted with m-DIPB as part of a 7 species study. The study was conducted as a limit test using a recirculating column elution apparatus providing a constant saturated solution. No immobility to Daphnia magna (NOEC) was observed in this test at at the mean measured concentration of 0.93 mg/L. Five other invertebrate species were also included in the 7 species studies and exposed for 96 hours. The LC50s for those 5 other invertbrate species were > 0.91 mg/L, the mean measured concentration of the saturated solution over 96 -hours. The results of these studies suggest no acute effects to invertebrate organisms at the limit of water solubility.