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EC number: 213-048-4 | CAS number: 919-30-2
Other distribution data
Administrative data
- Endpoint:
- other distribution data
- Adequacy of study:
- supporting study
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: The fugacity modeling was conducted using an accepted model. Measured and estimated data were both used for chemical-specific data required by the model.
Data source
Referenceopen allclose all
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 975
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 001
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 996
- Reference Type:
- secondary source
- Title:
- Material Safety Data Sheet. CAS No. 919-30-2
- Author:
- Union Carbide Chemicals and Plastics Company, Inc.
- Year:
- 1 992
- Report date:
- 1992
- Reference Type:
- other: estimation software
- Title:
- Estimations Programs Interface (EPI) Suite™. (The EPI Suite™ and the individual models included within the software are owned and copyright protected by the U.S. Environmental Protection Agency.)
- Author:
- United States Environmental Protection Agency
- Year:
- 2 000
Materials and methods
- Principles of method if other than guideline:
- The EQC model (Mackay 1996) was used for all fugacity calculations as recommended by EPA.
- Type of study:
- other: Fugacity Model Level I, II and III
- Media:
- other: other
Test material
- Reference substance name:
- 3-aminopropyltriethoxysilane
- EC Number:
- 213-048-4
- EC Name:
- 3-aminopropyltriethoxysilane
- Cas Number:
- 919-30-2
- Molecular formula:
- C9H23NO3Si
- IUPAC Name:
- silane
Constituent 1
Results and discussion
Any other information on results incl. tables
The EQC Level III model (USEPA, 2000) was used to evaluate
the fate, transport and distribution of this material
between environmental matrices, as recommended by EPA.
Level III Fugacity modeling, using loading rates for Air,
Soil, and Water of 1000 kg/h for each media, shows the
following percent distribution: Air = 0.7%; Soil = 91.6%;
Water = 7.7 %; Sediment = 0.00 %. However, this material is
unlikely to be found in the environment as it is
hydrolytically unstable.
Results from LEvel II modeling indiacte distribution to air, water and soil of 0, 99.8 and .2%, respectively.
Table 1. Physical and chemical properties of
3-aminopropyltriethoxysilane (CAS No. 919-30-2).
Molecular weight = 221
Data temperature (degrees C)= 25
Water solubility (g/m3)=7.6x-105 (Est.value Note1) (ref3)
Vapor pressure (Pa)= 2.0 (Extrapolated from
temperature-vapor pressure correlation Note2)
Log Kow = 0.31 (Est. value Note3)
Melting point (°C)= -70 (ref4)
Half-life in air (h)=2.4 (Est. value Note4)
Half-life in water (h)= 8.4 (Measured at pH 7.0, 25 °C)
(ref5)
Half-life in soil (h)=80 (Est. value Note5)
Half-life in sediment(h)=8.4 (Est. value Note5)
Note1 Water solubility of 3-aminopropyltriethoxysilane at 25 degrees C was estimated using the SAR Model WSKOWWIN (version 1.40). The model was used as received from the EPA.
Note2 Vapor pressure of 3-aminopropyltriethoxysilane at 25 degrees C was extrapolated from a temperature-vapor pressure relationship that was developed using experimental data measured at temperatures ranging from 55-122 degrees C.
Note3 Log Kow of 3-aminopropyltriethoxysilane at 25 degrees C was estimated using the SAR Model KOWWIN (version 1.66). The model was used as received from the EPA.
Note4 The half-life in air of 3-aminopropyltriethoxysilane at 25 degrees C was estimated using the SAR Model APOWIN (version 1.90).
The model was used as received from the EPA.
Note5 The overall half-life of 3-aminopropyltriethoxysilane in soil and sediment were estimated as a function of the measured hydrolysis
half-life and the estimated rate of biodegradation in water.
Biodegradation was estimated using the SAR Model BIOWIN (version 4.00), as received from the EPA. The BIOWIN
result for ultimate biodegradation timeframe (2.7344;
"weeks-months") was converted to an estimated half-life in water (900 hours) using the EPA default conversion factors in EPI Suite.
Biodegradation half-life in soil was assumed to be 2 times
longer than the BIOWIN estimate for water. Biodegradation
half-life in sediment was assumed to be 9 times longer than the BIOWIN estimate for water. The half-life in sediment was assumed to be equal to the measured hydrolysis half-life in water. Because of the decreased activity of water in soil, the hydrolysis half-life in soil was
assumed to be 10 times longer than the measured half-life in water.
The measured hydrolysis half-life for
3-aminopropyltriethoxysilane at pH 7.0 is 8.4 hours at 25 deg C. As such, 3-aminopropyltriethoxysilane will not exist in the 1environment, but will rapidly hydrolyze to ethanol and 3-aminopropylsilanetriol.
The environmental fate, transport, and distribution of
3-aminopropylsilanetriol were evaluated to provide a more
realistic assessment of 3-aminopropyltriethoxysilane.
Results from the simulation suggest that >99% of the total
steady-state mass of 3-aminopropylsilanetriol will reside in the water and soil compartments, and will not be found in air or sediment.
It is expected taht 65-85% of the 3-aminopropylsilanetriol
produced by the steady-state hydrolysis of
3-aminopropyltriethoxysilane will degrade in about 20-40
days.
Air % (Fugacity Model Level I): 0
Water % (Fugacity Model Level I): 99.8
Soil % (Fugacity Model Level I): 0.2
Applicant's summary and conclusion
- Conclusions:
- If released directly to air,
about 40% of the steady-state emission is expected to
degrade in air, 50% expected to partition to and degrade in
soil, and 6% expected to partition to and degrade in water.
When released to soil, 90% of the steady-state emission is
expected to degrade in soil, and 10% expected to partition
to
and degrade in water. When released to water, essentially
100% will degrade in water. Advection from the local
environment is expected to be insignificant (£ 1% of the
steady-state emission) for all emission scenarios. Global
persistence of 3-aminopropyltriethoxysilane in the model
system was about 3 days when released directly to air,
about 5 days when released to soil, and about 0.5 days
when released to water. If released simultaneously to all
three compartments (i.e., air, water, and soil), essentially
100% of the steady-state emission degrades in about 3
days. Based on Level-III modeling, it is expected that
> 99% of the total steady-state mass of
3-aminopropyltriethoxysilane will reside in the water and
soil compartments and will not be found in air or sediment
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