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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

69 % biodegradation based on ThOD after 28 days (OECD 301F). 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable
Type of water:

Additional information

The test substance diisotridecyl adipate was demonstrated to be readily biodegradable in three OECD guideline 301-tests.

An OECD 301F-study (Flach, 2014, key study) (guideline suitable for poorly soluble and volatile substances) with the test substance has been conducted, showing that DITA is readily biodegradable (69 % biodegradation based on ThOD after 28 days). The inoculum used in this study was neither adapted, nor pre-exposed (confirmation of the test institute attached). Two more studies (OECD 301B) are available, showing that DITA is readily biodegradable. In the first OECD 301B study, 81 % biodegradation were achieved within 28 d, fulfilling the 10d-window criterion (although not required for an UVCB). A second OECD 301B-test resulted in a biodegradation extent of 69.6 % after 28 days. The other studies reported for DITA clearly indicate the ready biodegradability of the substance, by almost reaching the 60% biodegradation threshold. In the respective study according to OECD guideline 301B, a biodegradation of 56.6% within 28 days was obtained with DITA. Similar biodegradation was found in the other 301F study (58.53% biodegradation within 28 days). Supporting all these findings, the read-across substance diisotridecyl dodecanedioate was found readily biodegradable in an OECD 301B-test. All of the studies mentioned above are considered valid.