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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Bioaccumulation: aquatic / sediment

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Administrative data

Link to relevant study record(s)

Description of key information

log BCF = 0.5 (estimated based on an experimental log Pow of 1.1) (ECT, 2010)

Key value for chemical safety assessment

BCF (aquatic species):
0.5 dimensionless

Additional information

In accordance with column 2 of Annex IX, the study does not need to be conducted if the substance has a low potential for bioaccumulation. The log Kow of 1.1 for butyric acid (OXEA, 2009) indicates a low potential for bioaccumulation. In addition the substance is readily biodegradable (Hüls, 1996). Therefore and for reasons of animal welfare a fish study is not performed.

The log BCF of butyric acid was estimated to be 0.5 (BCF = 3.162) using the program BCFBAF v3.00 (Part of US EPA EPI Suite v4.00). In addition, a log BAF (upper trophic) of 0.31 (BAF = 2.06) was calculated using the method of Arnot-Gobas (ECT, 2010). The low BCF/BAF values indicate a low potential of butyric acid for bioaccumulation in aquatic organisms.