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EC number: 201-877-4
CAS number: 89-04-3
Biodegradation in water: biodegradable
Significant (65%) degradation was observed
in a Closed Bottle test utilising a test concentration of 2 mg/L. A
modified MITI test using a high test concentration of 100 mg/L resulted
in low biodegradability.
The higher degree of biodegradation
observed in tests with a lower initial test substance concentration
indicates limited bioavailability. It is possible that the rate of
biodegradation may be limited by the rate of hydrolysis of the test
substance and/or the rate with which the substance dissolves. Modelling
of possible biodegradation pathways indicate that aerobic degradation is
likely, the first steps in this being hydrolysis to trimellitic acid and
octanol, both of which have been shown to be readily biodegradable.
Tests with a structural analogue of
the substance, a trimellitate ester with mixed C8 -C10 side chains,
showed significant biodegradation and, while not readily biodegradable,
this analogue can be considered to be inherently biodegradable. The
differences observed in tests on the two substances may be a result of
methodology, particularly important when testing “difficult” substances
– in this case, substances with low water solubility.
There are no data for sediment or
soil biodegradation studies relating to the substance. Such studies are
not needed due to the fact that the substance can be regarded as being
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