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Environmental fate & pathways

Phototransformation in air

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Description of key information

A Rate constant (for indirect photolysis) of  0.0000065 m³/(molecule*sec) is reported resulting in a DT50 of 59 hours. This value represents the worst case value out of the available DT50 values between 24 and 59 hours.

Key value for chemical safety assessment

Half-life in air:
59 h
Degradation rate constant with OH radicals:
0 m³ molecule-1 s-1

Additional information

In two publications data on the phototransformation in air of cumene is presented in the EU-RAR (2001) in section 3.1.1.2.1. Cumene is reported to have reaction rates of 6.14 -7.8 10 -12 [cm3 molec-1 s-1] and a DT50 of 1 -2.4 days by Lloyd et al. (1976).

In the publication of Atkinson (1990) the current knowledge of the gas-phase reactions occurring in the troposphere for alkanes, alkenes, alkynes, oxygenates and aromatic hydrocarbons and their photooxidation products is reviewed, and areas of uncertainty identified. A Rate constant (for indirect photolysis) of 0.0000000000065 cm³/(molecule*sec) has been reported for cumene. A DT50 of 59 hours can be calculated from this value. As a worst case assumption the longest DT50 of 59 hours value is selected as key value for the chemical safety assessment.