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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Two OECD 301B Ready Biodegradation Studies

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In 2005 an OECD 301B ready biodegradation study was conducted with dibutyl terephthalate. The results of that study indicated significant degradation occurred (44%), but not enough to classifiy the substance as readily biodegradable. After review of the degradation potential of the substance, it was believed that it was likely that there may be an issue with the low solubility of the substance reducing the bioavailability to the test organisms in the study. A second OECD 301B study was conducted in 2009 where the substance was introduced into the test system through application to fine silica gel to increase the surface area and bioavailability of the substance to the microorganisms. This study resulted in 76% degradation over 28 days and meeting the 10 day window criteria. Therefore, the test substance is considered to be "readily biodegradable".