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Environmental fate & pathways

Phototransformation in air

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Link to relevant study record(s)

Description of key information

Estimated half-lives for the components of this UVCB substance range from1.0 (higest molecular homolgue) to 1.8 hours (lowest molecular homologue) (West, 2010).

Key value for chemical safety assessment

Additional information

Estimated second-order rate constants for reaction of hydroxyl radical with lowest and highest-molecular weight homologues of the UVCB substance range from 2.8E-11 to 1.1E-10cm3/molecule*sec. Corresponding half-lives range from from1.0 (higest molecular homolgue) to 1.8 hours (lowest molecular homologue), based on a default hydroxyl radical concentration of 500,000 molecules/cm3. The longest estimated half-life, associated with the lowest-molecular weight homologue, is used to represent the atmospheric half-life of all homologous components of the UVCB substance in the chemical safety assessment.

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