Registration Dossier
Registration Dossier
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EC number: 202-849-4 | CAS number: 100-41-4
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Rate constant for indirect photolysis of ethyl benzene in air is 7.1 x 10-12 cm³/(molecule*sec) with a corresponding degradation half life in air (50% degradation for indirect photolysis) of 2.3 day(s).
Key value for chemical safety assessment
- Half-life in air:
- 2.3 d
Additional information
Rate constant (for indirect photolysis) of ethyl benzene in air was 7.1 x 10-12cm³/(molecule*sec) with a corresponding degradation half life in air (50% degradation for indirect photolysis) of 2.3 day(s)(Atkinson, 1989). The sensitiser for indirect photolysis was OH and the sensitiser concentration was 5 x 105molecule/cm³.
There were two supporting studies with measured values for indirect photolysis of ethylbenzene in air. These kinetics studies of the reaction of OH with ethylbenzene reported similar rate constant (for indirect photolysis) of 6.8 x 10-12and 8.2 x 10-12cm³/(molecule*sec) and with reported degradation half lives in air (50% degradation for indirect photolysis) of 2.4 and 2 day(s) respectively (Ohata and Ohyama, 1985; Ravishankava et al., 1978).
There was also one report for a calculated half life for indirect photolysis of ethyl benzene in air where the sensitiser (OH) concentration was 5 x 105molecule/cm³ for a 24 hr period. The rate constant (for indirect photolysis) was 5.9463 x 10-12with degradation half life in air (50% degradation for indirect photolysis) of 2.7 day(s) (BASF AG, 2006).
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