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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

No effect was measured up to a concentration of 1000 mg/L, oil shale is not harmful to activated sludge microorganisms and an inhibition of the degradation of sludge is not to be expected.

Key value for chemical safety assessment

Additional information

The respiration inhibition of the substance was tested in a OECD 209 -Activated Sludge, Respiration Inhibition Test.

The 3 h EC50 and NOEC of the test item for respiratory inhibition of activated sludge fed with synthetic sewage was > 1000 and ≥ 1000 mg/L, respectively. Therefore, the test item is not toxic to activated sludge microorganisms and an inhibition of the degradation activity of activated sludge is not to be expected.