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No test on hydrolysis is available. However, o-cresol is classified as readily biodegradable. Therefore no test is required according to REACH Regulation, Annex VIII, column 2. With regard to its chemical structure hydrolysis is not expected to be a relevant fate process.

Indirect photolysis in the atmosphere

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.

Indirect photolysis in the hydrosphere

In the presence of humic acids, indirect photolysis in water is to be expected. In a polluted eutrophic Swiss lake containing a dissolved organic matter concentration of 3.1 mg/l, the estimated natural half-life for o-cresol in the top meter as a result of exposure to June sunlight was 11 days.