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Registration Dossier
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EC number: 295-405-4 | CAS number: 92045-23-3 A complex combination of hydrocarbons produced by the distillation of the products of a steam cracking process. It consists predominantly of hydrocarbons having a carbon number of C4, predominantly 1-butene and 2-butene, containing also butane and isobutene and boiling in the range of approximately minus 12°C to 5°C (10.4°F to 41°F).
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1,3 -Butadiene is not considered to be readily biodegradable. 1,3 -Butadiene is also expected to have low potential for bioaccumulation and adsorption to soil and sediment based on its measured log Kow of 1.99. Structural analysis of the 1,3-butadiene molecule indicates that it is not expected to undergo hydrolysis in the environment due to the lack of hydrolysable functional groups. The physico-chemical properties of 1,3-butadiene indicate that the majority of this substance will ultimately be released to the atmosphere where it is quickly photooxidised with an estimated half-life of approximately 0.24 days.
1,3 -Butadiene is not expected to persist in the environment because it has a low potential for adsorption to organic matter, has a low potential for bioaccumulation and is rapidly degraded in the atmosphere by photooxidation reactions. The latter degradation mechanism will contribute significantly to the fate of 1,3-butadiene in the environment because it is a gas and preferentially partitions to this compartment.
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