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Environmental fate & pathways

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2-methylbutane is considered to be readily biodegradable on the basis of a proprietary study (ExxonMobil Chemical, 1996). This is a non-GLP study which followed guidelines equivalent to OECD guideline 301F manometric respirometry test. There were some minor deviations in test concentrations from the protocol, however these deviations were shown to not affect the integrity of the study as it meet the validity criteria. The study was therefore deemed suitable for assessment. This study indicates that 2 -methylbutane is readily biodegradable

The substance is expected to have a low potential for bioaccumulation and adsorption to soil and sediment based on the read across log Kow of 3.45 (Lide 2008). Structural analysis of 2 -methylbutane 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 2 -methylbutane indicate that the majority of the substances will ultimately be distributed to the atmosphere where they are quickly photooxidised. The photooxidative half lives for 2-methylbutane are 2.3 days (Atkinson 1985).

2 -methylbutane is not expected to persist in the environment because as it is readily biodegradable, has a low potential for adsorption to organic matter and low potential for bioaccumulation.

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