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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

87 % degredation of n-pentane occured within 28 days and so the substance is considered readily biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

The key study (ExxonMobil Chemical, 1997) is a GLP-compliant study which followed guidelines equivalent to OECD 301F manometric respirometry test. There were some minor deviations in test concentrations from the protocol but these were not considered to influence the integretory of the study, so the study was considered reliable and suitable for use as a key study for this endpoint. The study indicates that n-pentane is readily biodegradable.

This is supported by read across from other members of the category, which indicate that n-pentane is expected to be readily biodegradable. The study (ExxonMobil Chemical, 1996) was 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 and this has been read across to n-pentane.