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Environmental fate & pathways

Phototransformation in air

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Description of key information

A tropospheric half-life time of six hours has been determined based on a tropospheric hydroxyl radical concentration of 1 x 10(6)/ml. 

Key value for chemical safety assessment

Additional information

The study provides a rate constant of 3 x 10-11cm3/mole*sec for the indirect photolysis of MDA. A tropospheric half-life time of 6 hour was calculated assuming a tropospheric hydroxyl radical concentration of 1 x 106/ml (Becker al, 1988). These results are consistent with those obtained by QSAR (Pemberton et al., 2008)