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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


Pencycuron has a mean DT50 for hydrolysis of 628 days at pH 7, thus is considered to be stable under environmental conditions.

Using the Atkinson calculation, the DT50 for lifetime in air (based on the reaction with hydroxyl radicals) is 2.1 hours.


Pencycuron is considered not to be readily biodegradable as 42.5 % of pencycuron was degraded during 28 days in a test solution inoculated with domestic sewage plant effluent. 

The half life in freshwater (and in sediment) is based on the total system value from two water/sediment systems of 139 days and 82.6 days at 22°C for Ijzendoom and Lienden. When converted to 12°C these values are 354 and 210 days (average value of 282 days).

The soil half life (based on eight soils) is a median value of 192 days. The normalised modelling DT50 values for the eight soils were converted to 12°C to give the following DT50 values (in days at 12°C), 295 (Nisse), 329 (Howe), 251 (Hofchen), 372 (Laacherhof), 114 (Laacherhof AXXa), 134 (Dollendorf II), 90 (Laacherhof AIIIa) and 133 (Hoffchen). 

All DT50 values were calculated following FOCUS guidance.

Additional information