Registration Dossier
Registration Dossier
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EC number: 201-170-0 | CAS number: 79-03-8
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Parent compound propionyl chloride and hydrolysis product propionic acid: After evaporation or exposure to the air, the product will be slowly degraded by photochemical processes.
This estimation refers to dry air. In mist, rain, droplets and aerosols, hydrolysis will be the major fate process of the acid chloride due to the short half-life in aqueous solution. Therefore this estimate may be of low relevance.
Key value for chemical safety assessment
Additional information
Parent compound propionyl chloride: Based on an estimated OH radical rate constant of 0.593 E-12 cm3/(molecule*sec), the half-life of propionyl chloride was calculated to be 27 days (conditions: sensitizer for indirect photolysis: OH; 0.5 E06 OH/cm3, 24-h d; BASF SE, 2011). Based on the EPI Suite calculation the substance will be slowly degraded by photochemical processes, after evaporation or exposure to air.
This estimation refers to dry air. In mist, rain, droplets and aerosols, hydrolysis will be the major fate process of the acid chloride due to the short half-life in aqueous solution. Therefore this estimate may be of low relevance.
Hydrolysis product propionic acid (CAS 79 -09 -4): Based on an estimated OH radical rate constant of 1.39 E-12 cm3/(molecule*sec), the half-life of propionic acid was calculated to be 11.6 days (conditions: sensitizer for indirect photolysis: OH; 0.5 E06 OH/cm3, 24-h d; BASF SE, 2011). Based on the EPI Suite calculation the substance will be slowly degraded by photochemical processes, after evaporation or exposure to air.
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