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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 70% in 28 days (OECD 301B)

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

The biodegradability of Nonanoic acid, esters with adipic acid and trimethylolpropane was tested according to OECD 301B under GLP conditions using non-adapted activated sludge as inoculum. Based on the CO2 evolution a degradation rate of 70% was determined after 28 days. The 10-day-window was not met. However, the substance is an UVCB and according to “OECD Guidelines for the testing of chemicals – Revised introduction to the OECD guidelines for testing of chemicals, Section 3 – Part 1: Principles and strategies related to the testing of degradation of organic chemicals degradation” published by OECD (2006) the ready biodegradability data for mixtures should be evaluated carefully. For substances with different chain lengths the 10-day window should not be used for the interpretation of the results. It is possible that a sequential biodegradation occurred which might have led to a prolonged lag-Phase and therefore a slower biodegradation rate. In this case the pass level can be applied at 28 days. Hence, the test substance is determined to be readily biodegradable according to OECD criteria.

Based on the results of the available study Nonanoic acid, esters with adipic acid and trimethylolpropane is considered readily biodegradable.