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Environmental fate & pathways

Phototransformation in air

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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.

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