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Environmental fate & pathways

Phototransformation in air

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Description of key information

Degradation Half-life was 2.96 hr (or 0.246 day)
Degradation Rate constant with OH radicals was: 0.0000000000434 cm3/molecule-sec or 43.4 E-12 cm3/molecule-sec

Key value for chemical safety assessment

Half-life in air:
2.96 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

Additional information

Indirect photochemical degradation of the test material which is a trimellitate ester (i.e., 1,2,4-benzenetricarboxylic acid triester) as mediated byOH-attack is estimated to have ahalf-life of 0.246 days or 2.96 hr based on a 12 -hour sunlight day, a rate of 43.4 E-12 cm3/molecule*sec, and an average OH- concentration of 1.5E6 OH-/cm3. A 12-hour day half-life value normalizes degradation to a standard day light period during which hydroxyl radicals needed for photolysis are generated in the atmosphere. Although the test substance has the potential to degrade rapidly byOH-attack,multimedia distribution modeling indicates the test substance is predicted to partition negligibly (0.04%) to the air compartmentbecause it has a low vapor pressure ( 1.34 x e-12 Pa). Although the test substance has a relatively short atmospheric oxidation half-life (2.96 hours), this process is unlikely to contribute significantly to the loss of test susbtance (CAS No. 70225-05-7) from the environment. 

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