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EC number: 269-133-1 | CAS number: 68187-89-3
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
After evaporation or exposure to the air, acid chlorides, coco and its hydrolysis products will be rapidly to moderately degraded by photochemical processes.
Key value for chemical safety assessment
Additional information
The photodegradation potential of the parent substances is regarded to be of low relevance due to the rapid hydrolysis of the acid chlorides in aqueous solution. In mist, rain, droplets and aerosols, hydrolysis will be the major fate process. Therefore the assessment is based on the corresponding acids as their hydrolysis products.
Photodegradation potential estimated with AOPWIN v1.92 (0.5 E06 OH/cm³, 24h day)
Hydrolysis product |
CAS no. |
Rate constant |
DT50 |
|
cm³/molecules*s |
h |
d |
||
Octanoic acid |
124-07-2 |
8.3499E-12 |
46.1 |
1.9 |
Decanoic acid |
334-48-5 |
11.1760E-12 |
34.5 |
1.4 |
Lauric acid / Dodecanoic acid |
143-07-7 |
14.0021E-12 |
27.5 |
1.1 |
Myristic acid / Tetradecanoic acid |
544-63-8 |
16.8282E-12 |
22.8 |
0.95 |
Palmitic acid / Hexadecanoic acid |
57-10-3 |
19.6543E-12 |
19.6 |
0.82 |
Stearic acid / Octadecanoic acid |
57-11-4 |
22.4804E-12 |
17.1 |
0.71 |
Based on a 24 -h day and an OH-radical concentration of 0.5 E06 OH/cm³, the degradation rate constant for the six hydrolysis products varies between 8.35E-12 and 22.5E-12 cm³/(molecule*sec). Following this the substances are expected to be photodegraded by OH-radicals with a half-life of 0.7-1.9 days (BASF, 2012).
It can be concluded that acid chlorides, coco and its hydrolysis products will be rapidly to moderately degraded by photochemical processes after evaporation or exposure to air.
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