Registration Dossier

Environmental fate & pathways

Phototransformation in air

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Parent compound valeryl chloride and hydrolysis product valeric acid:
After evaporation or exposure to air, the substance 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 valeryl chloride: Based on an estimated OH radical rate constant of 5.8735 E-12 cm3/(molecule*sec), the half-life of valeryl chloride

was calculated to be 2.7 days (conditions: sensitiser 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 valeric acid: Based on an estimated OH-radical rate constant of 4.1108 E-12 cm3/(molecule*sec), a half-life of 3.9 days was calculated for the photochemical degradation by OH-radicals (conditions: sensitiser 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.