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EC number: 248-256-4
CAS number: 27138-01-8
The Reaction Mass of a,a,a’,a’-Tetramethyl-m-xylene-a,a’-diol and a, a, a’, a’ -Tetramethyl-p-xylene-a, a’-diol (m/p DIOL), was not readily biodegradable under the conditions of the test OECD 301B. A mean total of 2.0% degradation was achieved by Day 28.
biodegradability of the Reaction Mass of a,a,a’,a’-Tetramethyl-m-xylene-a,a’-diol
(m/p DIOL) was assessed over a 28 day period by the CO2Evolution
(Modified Sturm) Test. The
study was conducted in accordance with procedures outlined in OECD
Guideline 301B (1992).
The results of the
test were as follows (28 day percent biodegradation values):
biodegradation determined in the Toxicity Control bioreactor is
expressed in terms of the total organic carbon content resulting from
the reference item only (A) and for the total organic carbon resulting
from the reference and test item (B).
The test item (The
Reaction Mass of a,a,a’,a’-Tetramethyl-m-xylene-a,a’-diol
(m/p DIOL) was not readily biodegradable under the conditions of the
test as it failed to achieve a transition from 10% to 60% degradation in
a 10 day window during the 28 day test. The
test item was not considered to be inhibitory to the microbial inoculum
since the biodegradation observed in the toxicity control bioreactor was
similar to that expected from the individual test and reference
The test failed to meet the validity
criterion with respect to the differences in extremes of percent
biodegradation in the test bioreactors. However, this was judged to be
due to very low biodegradation values observed (1.8 and 2.2% for Test
Bioreactors 1 and 2 respectively) and the possible influx of atmospheric
CO2 into the final trap on Day 29. The test is therefore considered
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