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EC number: 236-828-6 | CAS number: 13501-76-3
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
(3-chloropropyl)diethoxymethylsilane and its hydrolysis product (3-chloropropyl) methylsilanediol 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 photo chemically-produced hydroxyl radicals may occur.
The SRC AOPWIN program(v1.92)has been used to obtain values of the rate constantkOHfor reaction of (3-chloropropyl)diethoxymethylsilaneand (3-chloropropyl)methylsilanediolwith 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 4.1.2.
Table4.1.1Results of photodegradation in air calculations
Parameter |
Result, (3-chloropropyl)diethoxymethylsilane |
Result, (3-chloropropyl)methylsilanediol |
|||
kOH (cm3 / molecule.sec) |
14.6 x 10-12 |
6.1 x 10-12 |
|||
kdegair (d-1) |
0.63 |
0.26 |
|||
DT50 (days) |
1.1 |
2.7 |
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