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Toxicity to soil microorganisms

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Description of key information

The 10 hour IC50 (respiration inhibition) of o-xylene is 0.22mg/g soil

Key value for chemical safety assessment

Additional information

A single study to investigate the effects of o-xylene on soil microorganisms was identified. This study reported a 10 hour EC50 of 220mg/kg nominal. Although this study does not follow the standard guidelines for measuring respiration inhibition of soil microorganisms it is well documented and scientifically acceptable. The test design uses a closed system and analytical monitoring. The exposure period is only 10 hours compared to the standard 28 days. Therefore, although we consider this test reliable, this study will not be used to derive the PNEC in the risk assessment.

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