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Environmental fate & pathways

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1,3 -butadiene has a low potential for bioaccumulation, with a BCF of 9.8 calculated using the log Kow. As 1,3 -butadiene is a gas that will rapidly volatilize from the aquatic environment, direct and indirect exposure in the aquatic environment is unlikely.

The screening criterion for bioaccumulation in the PBT assessment is that a substance with a log Kow of ≤4.5 is not B or vB. The measured log Kow of 1.99 indicates that 1,3-butadiene does not exceed the screening criteria for bioaccumulation stipulated in ECHA’s Guidance on information requirements and chemical safety assessment - Part C: PBT Assessment (2008). Therefore, 1,3-butadiene is not considered to be bioaccumulative (B) or very bioaccumulative (vB).