Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

Diuron will rapidly disappear in air as evidenced by the calculated half-life of 2.9 to 3.1 hours. Diuron is hydrolytically stable at pH 5, 7 and 9 for 120 hours at 50 °C, in the dark. The hydrolytic degradation of Diuron is less than 10 % and the corresponding half life at ambient temperature (calculated using Arrhenuis equation) estimated to be longer than 1 y. Therefore, chemical hydrolysis can be excluded as a dissipation mechanism of Diuron in environmental systems.

In irradiated solution Diuron degraded with a calculated half-life of about 43 days under natural (latitude 30 -50 ºN) sunlight assuming 12 hours of daylight. The quantum yield (the number of photons destroyed/the number photons absorbed) of direct photodegradation of Diuron in pure water was calculated to be 0.0243. UV spectra and model assessments indicate that the elimination of Diuron from the aquatic environment via direct photodegradation is to be expected.