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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The lowest result is a 24 hour EC50 of 1 mg/L for o-xylene.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
1 mg/L

Additional information

Data are available on the acute toxicity of each of the xylene isomers to aquatic invertebrates. The study by Galassi et al (1988) follows OECD 202 and uses Daphnia magna, whilst Holcombe et al (1987) used a flow through system to expose different species (including Daphnia magna) simultaneously. Niederlehner et al (1998) used Ceriodaphnia dubia as the test organism. All studies included analytical confirmation of the exposure concentrations.

The 24 and 48 hour EC50 results reported from these studies for the different isomers are very similar, with a range of 1-4.7mg/L. In the study by Niederlehner et al (1998) the highest concentration tested did not result in effects on mortality, so the EC50 is >3.4mg/L. The most conservative result from the individual isomers will be used in the risk assessment.