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Environmental fate & pathways

Phototransformation in air

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Description of key information

Predicted atmospheric half-life: 5.0 hours

Key value for chemical safety assessment

Additional information

No measured data on photo-transformation are available. A half-life in air of 5.0 hours has been proposed based on an OH radical concentration of 5x10exp5 molecules/ml (TGD default). The US EPA AOPWIN programme gives a predicted rate constant of 77.29x10exp-12 cm3/molecule.sec. With the TGD model for photodegradation, this is equivalent to a half-life of 5.0 hours.

Reference:

- European Commission (2003),Technical Guidance Document on Risk Assessment (TGD). 2ndedition, Part II.