Registration Dossier
Registration Dossier
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EC number: 203-636-9 | CAS number: 108-99-6
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.3 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 3 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.03 mg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 3 mg/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 2 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 4.5 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.45 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:
- 0.73 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
3-Methylpyridine is not an acute short-term aquatic hazard. The key values for the chemical category include a 96 hr LC50 for fish of 560 mg/L, a 48-hour EC50 for crustacea of 320 mg/L and a 72 hr EC50 for algae or aquatic plants of 320 mg/L; each of these values is higher than the threshold of 1 mg/L for a short-term acute aquatic hazard. 3-Methylpyridine does not qualify as an acute aquatic toxicant. The substance is readily biodegradable and is not bioaccumulative (the log Kow of 1.2 is substantially below the threshold log Kow of 4), and therefore is not a chronic long-term aquatic hazard
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