Registration Dossier
Registration Dossier
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EC number: 204-881-4 | CAS number: 128-37-0
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.199 µg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 1.99 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.02 µg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 0.017 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.458 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.046 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:
- 0.054 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- PNEC oral
- PNEC value:
- 16.67 mg/kg food
- Assessment factor:
- 30
Additional information
Long term toxicity to fish study according to GLP-standards and OECD guideline 210. The NOEC of BHT in Oryzias latipes was 0.053 mg/L and the LOEC was 0.14 mg/L.
Long term toxicity to aquatic invertebrates according to OECD guideline 211 and GLP standards. The 21 -day NOEC of BHT in Daphnia Magna was 0.069 mg/L and the 21 -day EC50 was 0.096 mg/L.
Conclusion on classification
Based on the available ecotoxicological information:
Short-term toxicity to fish: The estimated 96-h LC50 for fish is 0.199 mg/l (ECOSAR v1.00a, phenols class).
Short-term toxicity to aquatic invertebrates: The 48-Hour EC50 based on the geometric mean measured test concentrations was 0.48 mg/L with 95% confidence limits of 0.39 - 0.70 mg/L and the No Observed Effect Concentration was 0.15 mg/L.
Toxicity to aquatic algae: The estimated 96-h EC50 for green algae is 0.758 mg/l (ECOSAR v1.00a, phenols class).
Since the values are below 1 mg/L and the substance is considered as not readily biodegradable and has a log Pow greater than 4, the substance is classified as follows:
Hazardous to the aquatic environment, Chronic Hazard Category 1 and Acute Hazard Category 1 (M-factor 1).
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