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Toxicity to soil macroorganisms except arthropods

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Description of key information

No data on chronic terrestrial toxicity are available. However, the substance is not persistent in the soil compartment. The equilibrium partitioning method has been used for assessing the hazard to soil organisms.

Key value for chemical safety assessment

Additional information

A study on the toxicity of styrene to earthworms (Eisenia foetida) was carried out using OECD Guideline 207 (Springborn, 1995). The test was conducted under a cover to reduce volatilisation of the test substance. The concentration of styrene in the soil was measured at the start and at the end of each seven-days period. Total exposure time was 14 days. Results of the test were a 14 -day LC50 of 120 mg/kg and a NOEC for weight change of 44 mg/kg. However, Alexander (1997) re-evaluated the study in terms of the minimum concentration to which the worms were exposed over the course of the study. He concluded that the NOEC value could be assumed to be 34 mg/kg, if not higher.

Taking into account the very large discrepancy between nominal concentrations and analytical masurementes (even at day 0) in the test, it seems more appropriate to base the effects on nominal concentrations.

Basing the results on nominal concentrations the EC50 would lie in the range 500 - 1000 mg/kg dw