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Toxicity to soil microorganisms

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Description of key information

- EC50 (28d): >1000 mg/kg dw test mat. (nominal) based on: nitrate formation rate
- NOEC (28d): ≥1000 mg/kg dw test mat. (nominal) based on: nitrate formation rate

Key value for chemical safety assessment

Additional information

A nitrogen transformation test is available for the UVCB substance GTL Base Oil Distillates. The test was conducted in accordance with OECD 216 and GLP.

Soil microorganisms were exposed to the substance at concentrations of 1000 mg/kg (dry weight) for 28 days at a temperature of 21°C, in the dark, on natural soil with an organic carbon content of 0.97 ± 0.07% with addition of Lucerne-green-grass meal as a respiratory substrate. The inhibitory effect of the test substance on nitrogen transformation was determined by measurement of nitrate concentrations in soil samples taken on Days 7, 14, 21 and 28, in comparison to control samples.

The effect of the test substance on nitrogen transformation gave an EC50greater than 1000 mg/kg dw.