Registration Dossier
Registration Dossier
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EC number: 242-262-0 | CAS number: 18379-25-4
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.32 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 1 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.032 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 4 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 2.1 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.21 mg/kg sediment dw
- Assessment factor:
- 10
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.24 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Additional information
Short-term aquatic toxicity data for trichloro(2,4,4-trimethylpentyl)silaneare available for fish; long-term data are available for invertebrates. The test organisms were primarily exposed to the hydrolysis product because the substance hydrolyses very rapidly to2,4,4-trimethylpentylsilanetriol and hydrogen chloride. Hydrogen chloride is not harmful to aquatic organisms. The PNECs are therefore discussed in terms of the silanol hydrolysis product,2,4,4-trimethylpentylsilanetriol.Short-term data for algae are read-across from the substance trichloro(phenyl)silane, which hydrolyses very rapidly to phenylsilanetriol and hydrogen chloride.
The relevant values are:
Fish:LC50 (96-h): >100 mg/l; NOEC ≥100 mg/l
Daphnia:NOEC (21-day): 32 mg/l
Algae:EC50 (96-h): >100 mg/l; NOEC: ≥100 mg/l
The standard approach to PNEC calculation when long-term data are available for two trophic levels, including that which was found to be most sensitive in the short-term tests, is to apply an assessment factor of 50 to the lowest NOEC. However, in this case no short-termdaphniadata are available and there is some uncertainty in the algal results resulting from the fact that the data are read-across. Therefore, an assessment factor of 100 is used.
Therefore, PNECaquatic is 32/100 =0.32 mg/l.
Conclusion on classification
It is proposed that the substance should not be classified in the EU for the environmental because reliable data for a suitable read-across substance indicate that the substance is not toxic at a loading rate of 100 mg/l. The substance hydrolyses rapidly and the silanol hydrolysis product has a low log Kow.
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