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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The lowest results are a 72 hour EC50 of 2.2 mg/L and a 72 hour NOEC of 0.44 mg/L, both for p-xylene.

Key value for chemical safety assessment

EC50 for freshwater algae:
2.2 mg/L
EC10 or NOEC for freshwater algae:
0.44 mg/L

Additional information

Data are available on the ecotoxicity of each of the xylene isomers to algae. The studies by Galassi et al (1988) and TNO (2004) followed OECD 201, whilst Herman et al (1990) used a non-standard method. All studies included analytical confirmation of the exposure concentrations.

The EC50 results reported from these studies for the different isomers are very similar, with a range of 2.2 -4.9mg/L. The most conservative result from the individual isomers was reported by TNO (2004) for p-xylene. This was the only study that also reported NOEC values. These values will be used in the risk assessment.