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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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.