Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

Estimated half-lives for the components of this UVCB substance range from 3.5 to 14.3 hours (Dow, 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 2.7E-11 to 1.1E-10cm3/molecule*sec. Corresponding half-lives range from from 3.5 (higest molecular homolgue) to 14.3 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.