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Environmental fate & pathways

Hydrolysis

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Description of key information

Diuron is not susceptible to abiotic hydrolysis, is hydrolytically stable at pH 5, 7 and 9 for 120 hours at 50 °C, in the dark. Therefore, chemical hydrolysis can be excluded as a dissipation mechanism of Diuron in environmental systems.

Key value for chemical safety assessment

Additional information

A GLP guideline study (OECD 111) is available for this test substance. The hydrolytic stability of Diuron under abiotic conditions is not dependent on pH. The degradation of Diuron being less than 10 % at pH 4, 7 and 9 and the corresponding half life, at ambient temperature (calculated using Arrhenuis equation), estimated to be longer than 1 yr (Wilfinger, 2007)