Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.2 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
2 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.02 mg/L
Assessment factor:
5 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
10 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
0.767 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.077 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:
0.036 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

The predicted half-life of N-[3-(trimethoxysilyl) propyl]butylamineat 20-25°C is 4.0 h at pH 7. The substance will therefore undergo rapid hydrolysis in contact with water to form 3-(N-butylamino)propylsilanetriol and methanol.The silanol hydrolysis product is not readily biodegradable.

N-[3-(trimethoxysilyl) propyl]butylamine (CAS No. 31024-56-3) is not classified for the environment in the EU according to Regulation (EC) No 1272/2008 because measured data for the structurally analogous substanceN-ethyl-3-trimethoxysilyl-2-methylpropanamine (CAS No. 227085-51-0) indicate that both the parent substance and the silanol hydrolysis product are not toxic. Short term data are available and the lowest EC/LC50is > 100 mg/l.