Registration Dossier
Registration Dossier
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EC number: 202-603-6 | CAS number: 97-72-3
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.026 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.26 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.003 mg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 19 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.364 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.036 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.046 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Additional information
Hydrolysis studies show that isobutyric anhydride added to water rapidly converts to isobutyric acid. Thererfore, isobutyric acid data is being used by read across for most environmental fate and ecotox endpoints.
Conclusion on classification
Following DSD/DPD, the substance is not to be classified as dangerous for the environment since the acute toxicity is >10 to <=100 mg/L, the substance is readily biodegradable and does not bioaccumulate significantly (experimentally determined log Kow < 3).
Following CLP, the substance is not to be classified as hazardous to the aquatic environment since the acute toxicity is >10 to <=100 mg/L, the substance is readily biodegradable and does not bioaccumulate significantly (experimentally determined log Kow <= 4). The only long-term data point for algae (72 hour EC10 = 29.4 mg/L) is > 1.0 mg/L and thererfore does not affect the chronic hazard classification.
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