Registration Dossier
Registration Dossier
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EC number: 297-648-1 | CAS number: 93685-99-5 Oil shale waste is produced by thermal processing in a fluidized bed process at 800°C from mining exhausted oil shale. Oil shale waste consists essentially of Al2O3, CaO, CaSO4, Fe2O3 and SiO2.
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
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 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.
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