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.
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
PBT/vPvB criteria and justification
Persistence Assessment
Oil shale thermal processing residueis inorganic substances.The PBT and vPvB criteria of Annex XIII to the Regulation do not apply to inorganic substances.Based on the chemical nature of oil shale thermal processing residue (inorganic structure and chemical stability of the main compound: Si-O bond is highly stable), neither photo- or chemical degradation, nor biodegradation (due the absence of carbon atoms within the molecule) is expected.
Therefore, degradation is considered negligible.
Bioaccumulation Assessment
The PBT and vPvB criteria of Annex XIII to the Regulation do not apply to inorganic substances. And it is not appropriate to apply classical concepts (e. g. use of bioconcentration factors; BCF -biomagnification factors; BMF) to an inorganic UVCB substance as they would be applied to organic substances. Due to the fact that oil shale thermal processing residues are UVCBs no overall BCF can be determined, however considering the extremely low recovery rate of ash contents, experiences from toxicological investigations and based on the structure-related properties of the substance, bioavailability and therefore bioconcentration is not expected. Furthermore, the measured data for the tested oil shale thermal processing residue shows also only an insignificant content of metals.
Therefore,oil shale thermal processing residuedoes not meet the B criterion.
Toxicity Assessment
The PBT and vPvB criteria of Annex XIII to the Regulation do not apply to inorganic substances. From the ecotoxicity perspective the toxicity criterion is not met for oil shale thermal processing residue with EC50/LC50 values of greater than 100 mg/L (algae, daphnia, fish) being clearly beyond the ecologically relevant EC or LC triggers of less than 0.1 mg/L. All data give comparable results for fish, invertebrates and aquatic plants.
The substance is not classified as carcinogenic, mutagenic or toxic for reproduction nor is there any evidence of chronic toxicity, as identified by the classifications: T, R48, or Xn, R48 according to Directive 67/548/EEC.
Therefore,oil shale thermal processing residuedoes not meet the T criterion.
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