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Environmental fate & pathways

Phototransformation in air

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Description of key information

After evaporation or exposure to air, the substance and its hydrolysis product ethanol will be slowly degraded by photochemical processes.

Key value for chemical safety assessment

Half-life in air:
10 d

Additional information

The photodegradation half-life in air of ethyl chloroformate was calculated to be 9.66 d (test conditions: sensitiser for indirect photolysis: OH; 0.5 E06 OH/cm³, 24-h d) (US EPA, 2008). This estimation refers to dry air. In mist, rain, droplets and aerosols hydrolysis will be the major fate process in air due to the short half-life in aqueous solutions. Hydrolysis product ethanol: Based on the selected value of 3.27E-12 cm³/(molecule*sec) for the measured OH radical rate constant at 25 °C (OECD, 2005) and assuming a 24-h day with a mean concentration of 0.5E06 OH/cm³, a half-life of 4.9 ± 1 d can be calculated.