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EC number: -
CAS number: -
Not readily or inherently biodegradable
A study was performed to assess the ready biodegradability of
Reddish Blue. The study was conducted in accordance with the OECD
Guideline for Testing of Chemicals No. 301 F 'Manometric respirometry
Test' (adopted July 17, 1992). A solution of Reddish Blue in a mineral
medium was inoculated and incubated for 28 d under aerobic conditions.
During this period, degradation was followed by BOD determinations. Test
item showed: 1% degradation after 28 days. Therefore, Reddish Blue is
considered to be "Not Readily Biodegradable". The control substance
monoethylene glycol showed 83% degradation, proving the validity of the
In addition, a study for inherent biodegradability of Reddish Blue
was performed according to the OECD Guidelines for the Testing of
Chemicals, Inherent Biodegradability: Modified MITI Test II.: OECD,
Adopted 12 May 1981.
As the test substance was difficult soluble in water, the test
substance was dissolved with acetone, and some acetone solution of test
substance was added to the flask. The acetone was volatile completely
and the test substance remained absorbed to the bottom and inner surface
of the flask uniformly.
Results of recovery tests showed that the percent recovery of the
test substance from water + test substance was 72.2% and the recovery
from test medium + inoculum + test substance was 72.1% at start of the
At the end of the test, the residual content of test substance of
abiotic control and the three test suspensions were 10.7mg and 11.3mg,
11.0mg and 11.1mg (3 replicates), respectively. Considering the
extracting efficiency, the reduction of the test substance in abiotic
control might be due to the loss during extraction process of test
substance but not non-biodegradation. The percentage primary
biodegradation of test suspensions was 0%.
The percentage biodegradation at the end of the test substance by
BOD was 0%.
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