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Environmental fate & pathways

Phototransformation in air

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Description of key information

Atmospheric half-life approximately 1.7 days (40 hrs.), assuming OH concentration of 500,000 molecules/cm3 and 24 hr photoday

Key value for chemical safety assessment

Half-life in air:
1.7 d

Additional information

The reaction of diphenyl ether with OH radical was measured in the laboratory, giving an experimental second-order rate constant which can be used to predict half-life in the atmosphere. Diphenyl ether is rapidly degraded in the atmosphere by reaction with photochemically-generated hydroxyl radicals. By virtue of this reaction and associated half-life (1.7 days), the substance is not persistent in air, and not expected to exhibit long-range atmospheric transport.