Registration Dossier
Registration Dossier
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EC number: 201-286-1 | CAS number: 80-51-3
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 5.9 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 3.5 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.59 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 0.35 µg/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 0.5 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.54 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.054 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:
- 0.1 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
OBSH is classified for the environment as Aquatic Acute 1; H400 (M=1) and Aquatic Chronic 1; H410 (M=1).
This is based on the lowest acute toxicity data in the range of 0.1 mg/L - 1 mg/L (i.e., 72h-ErC50 of 0.35 mg/L, algae, mean measure concentration), and chronic toxicity data in the range 0.01 - 0.1 mg/L (i.e., 72h-NOErC of 0.059 mg/L, algae, mean measure concentration). Hydrolysis half-life of OBSH is < 16 days, but it cannot be demonstrated that hydrolysis products do not fulfil the criteria for classification as hazardous to the aquatic environment. Therefore, the substance is considered not rapidly degradable (please refer to CLP regulation (section 4.1.2.9.4) and ECHA Guidance ((ECHA, 2017), Annex II.4).
Furthermore, for substances where the degradation half-life is less than 12 hours as it is the case for OBSH, environmental effects are likely to be attributed to the hydrolysis products rather than to the parent substance itself (CLP Guidance (ECHA, 2017), chapter 4.1.3.1.1.). One of the hydrolysis products, i.e. hydrazine is harmonised classified as Aquatic Acute 1 and Aquatic Chronic 1 (Index number 007-008-00-3).
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