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EC number: 271-176-6 | CAS number: 68516-73-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Not readily biodegradable (according to OECD criteria).
Key value for chemical safety assessment
Additional information
Data on the ready biodegradability of the
described 'yellow disazo condensation pigment' are not available.
However, for one yellow pigment (CAS 5280-80-8) the inherent
biodegradability was investigated according to OECD guideline 302C
(Solvias, 2000). Based on the measured oxygen consumption 12%
degradation was observed after 28 days. Therefore the test item cannot
be considered as inherently biodegradable. This result supports two
model calculations which were conducted with EPI Suite v4.11 and
CATALOGIC v5.11.5. The EPI Suite v4.11 (BIOWIN Program v4.10)
calculation resulted in "not readily biodegradable" and the calculation
with CATALOGIC v5.11.5 (BOD 28 days MITI (OECD 301C) v06.07) resulted in
ca. 32.35 % biodegradation after 28 d. Even though the structural domain
was correct with only 61.54 % (38.46 % unknown) the results support the
overall conclusion that the ‘yellow disazo condensation pigments’ are
neither readily nor inherently biodegradable.
Moreover, the 'yellow disazo condensation pigment' is practically
insoluble and therefore considered to be essentially not bioavailable.
Due to the large molecular size, cellular uptake of the pigment is
unlikely. Hence intracellular biodegradation, which is the main
degradation route of bacteria, is probably low. It can be concluded that
the substance is likely to persist in the environment. For this reason
no ready degradation studies are proposed.
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