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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Link to relevant study record(s)

Description of key information

The half-life of o-cresol in the atmosphere is approximately 9 h due to degradation by OH radicals with an 24h-average concentration of 500000 radicals/mL .

Key value for chemical safety assessment

Half-life in air:
9 h

Additional information

In the atmosphere, o-cresol will react with photochemically produced hydroxyl-radicals. In his critical review Atkinson recommended values for the reaction constant kOH at room temperature of 4.2 x 10-11 cm³ x molecule-per second. Based on a tropospheric OH radical concentration of 5 x 105 molecules per cm³ a corresponding half-life of 9.0 h can be calculated.