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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

The lowest result is a 7 day NOEC of 0.96 mg/L for ethylbenzene.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater invertebrates:
0.96 mg/L

Additional information

Two chronic aquatic invertebrate ecotoxicity studies are available, with ethylbenzene, m- and p-xylene as the test substances. Niederlehner et al (1998) investigated the effects of m-xylene and ethylbenzene on Ceriodaphnia dubia reproduction over 7 days. The LOEC of 1.7 mg/L from Niederlehner et al (1998) for chronic toxicity of ethylbenzene to invertebrates was taken by Environment Canada as the critical toxicity value for ethylbenzene toxicity to aquatic species in the Draft Screening Assessment Report (Environment Canada 2014). Bjornestad et al (2005) investigated the effects of p-xylene on Daphnia magna reproduction over 21 days following OECD 211. Both studies included analytical confirmation of the exposure concentrations.

The three reported NOECs from studies are similar, 0.96 mg/L (ethylbenzene) 1.17 mg/L (m-xylene) and 1.57 mg/L (p-xylene). The lowest value will be taken forward.