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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

OECD 216:
- EC50 (28-d): 320 mg/kg dw test mat. (nominal) based on: nitrate formation rate;
- NOEC (28-d): 180 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 GTL Gasoil (Clarke, 2010). The test was conducted in accordance with OECD 216 and GLP.

Soil microorganisms were exposed to GTL Gasoil at concentrations of 100, 180, 320, 560 and 1000 mg/kg (dry weight) for 28 days at a temperature of 21°C, in the dark, 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 EC50of 320 mg/kg dw and a NOEC of 180 mg/kg dw.

The following information is taken into account for toxicity to terrestrial microorganisms:

(28-d) EC50320 mg/kg dw soil micro-organisms.

Value used for CSA:

Long-term EC50for soil microorganisms: 320 mg/kg dw.

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