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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Biodegradation in water: screening tests

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Administrative data

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Description of key information

QSAR estimation method

Key value for chemical safety assessment

Additional information

Testing of ethylbenzene for biodegradability in water is complicated because of its high volatility.


The environmental fate of ethylbenzene in water will be determined by biotic and abiotic degradation.


QSARs estimated half-live for biodegradation of ethylbenzene in water based upon BIOWIN Ultimate Biodegradation is 360 hours (15 days). Whereas the half-lives of ethylbenzene for volatilization from water are estimated as 0.05 days (for a river) to 4.11days (for a lake) using EPI Suite software.


The QSAR models predicts timeframe within days-weeks for primary biodegradation of ethylbenzene and weeks for its ultimate degradation.


Overall ready biodegradability prediction provided by a number of BIOWIN (v.4.10) models suggests ethylbenzene is not ready biodegradable in the environment.