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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The lowest 96 hour LC50 is 2.6 mg/L for p-xylene.

Key value for chemical safety assessment

LC50 for freshwater fish:
2.6 mg/L

Additional information

Data are available on the acute toxicity of each of the xylene isomers to fish. The studies by Galassi et al (1988), Springborn (1994) and DiMarzio et al (2004) follow OECD 203, whilst Holcombe et al (1987) used a flow through system to expose different species simultaneously. Galassi et al (1988), Springborn (1994) and Holcombe et al (1987) used a standard test species, whilst DiMarzio et al (2004) tested a nonstandard freshwater fish. All studies included analytical confirmation of the exposure concentrations.

The 96hr LC50 results reported from these studies for the different isomers are very similar, with a range of 2.6 -11.23mg/L. The most conservative result from the individual isomers will be used in the risk assessment.