Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
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 |
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
