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EC number: 250-437-8 | CAS number: 31024-56-3
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
N-[3-(trimethoxysilyl) propyl]butylamine and its hydrolysis product 3-(N-butylamino) propylsilanetriol contain no chromophores that would absorb visible or UV radiation, so direct photolysis is not likely to be significant. Indirect photolysis resulting from gas-phase reaction with photochemically-produced hydroxyl radicals may occur. The SRC AOPWIN program (v1.92) has been used to obtain values of the rate constant kOH for reaction of -[3-(trimethoxysilyl) propyl]butylamine and its hydrolysis product 3-(N-butylamino) propylsilanetriol with hydroxyl radicals. This prediction method has not been validated to assess applicability to silanes and silanols; therefore, there is uncertainty associated with the calculated values obtained.
The overall half-life in air under default conditions of hydroxyl radical concentration was calculated using the following expressions
kdegair(d-1) = kOH(cm3/molecule. sec) x OH Concair(molecules/cm3) x 24 x 3600
DT50(d) = ln 2/ kdegair(d-1)
Where:
kdegair= total rate constant for degradation in air
kOH= rate constant for reaction with hydroxyl radicals
OH Concair= concentration of hydroxyl radicals in air = 5 x 105OH molecules/ cm3
DT50= half-life
The results are given in table below:
Table4.1.2. Results of photodegradation in air calculations
Parameter | Result, N-[3-(trimethoxysilyl) propyl]butylamine | Result, 3-(N-butylamino) propylsilanetriol |
| ||
kOH(cm3/molecule. sec) | 92.26E-12 | 100.123E-12 | |||
kdegair (d-1) | 3.98 | 4.32 | |||
DT50(days) | 0.17 | 0.16 |
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