Registration Dossier
Registration Dossier
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EC number: 218-507-2 | CAS number: 2167-23-9
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.083 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.008 mg/L
- Assessment factor:
- 10
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 2 mg/L
- Assessment factor:
- 10
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.97 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.097 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.15 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential to cause toxic effects if accumulated (in higher organisms) via the food chain
Additional information
Conclusion on classification
Three acute endpoints for three different trophic levels are available for 2,2 -di(tert-butylperoxy)butane. No effects were found in any of the tests up to the water solubility limit.
The substance is not readily biodegradability and has a log Kow of 5.4.
Acute classification:
Acute endpoints are all > water solubility limit, therefore under Regulation (EU) No 286/2011 (2nd ATP to CLP) 2,2 -di(tert-butylperoxy)butane is not classified acute aquatic hazardous.
Chronic classification:
The chronic ErC10 for algae was not reached and is greater than the water solubility limit. Classification based on aquatic test data is therefore not possible. However, 2,2 -di(tert-butylperoxy)butane is not readily biodegradable and has a high log Kow, it should therefore be classified Category chronic 4.
Proposal for classification: Category chronic 4
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