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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

5.2 Biodegradation

n-Butyraldehyde tested for biodegradability in several studies proved to be readily biodegradable:

Using an electrolytic respirometer and activated sludge under MITI(I) ready-biodegradability conditions, theoretical BODs of 46-57% of the Theoretical Oxygen Demand (ThOD) were observed after 90-135 h of incubation (approx. 4 - 6 days) (Urano and Kato 1986). Furthermore, 100% degradation of n-Butyraldehyde was recorded over a 2wk period (MITI test, corresponding to OECD Guideline 301C) (MITI 1992).


An anaerobic laboratory model for wastewater treatment systems using an enriched methanogenic baterial culture in a batch as well as in a continous-flow reactor demonstrated a degradation efficiency of 99% after a 7d lag period in batch culture and 82 % in the flow-through system after 52 days (Chou et al 1979).


Based on the inherent properties and ready biodegradability of n-Butyraldehyde in water, rapid elimination of the substance can also be predicted in compartments in sediment and soil by analogy.

Additional information