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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Two reliable studies for 2-methylbut-2-ene (CAS 513-35-9) show  the substance not to be readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Two reliable proprietary studies, Huntingdon (2004c) and ExxonMobil (2005) are available for the isomer 2-methylbut-2-ene (CAS 513-35-9). Since isoamylene (2-methylbutene, CAS 26760-64-5) is a mixture of the two isomers, 2-methylbut-2-ene (CAS 513-35-9) and 2-methylbut-1-ene (CAS 563-46-2) and in the absence of any reliable data for isoamylene the data for the isomer (CAS 513-35-9) are considered suitable for read-across. Both of these studies showed 2-methylbut-2 -ene (CAS 513-35-9) as not being readily biodegradable.