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EC number: 240-521-2
CAS number: 16470-24-9
Under test conditions no biodegradation
In the ready biodegradability test,
performed according to OECD guideline 301A (key study), a DOC removal of
1.2 % was observed; hence, the substance is not readily biodegradable
(Ciba-Geigy Ltd., 1992).
The QSAR based screening criterion for
identifying substances for persistency (P and vP) confirmed that the
substance is expected to be persistent and this estimated behaviour is
further supported by the results obtained from some BOD5:COD studies
available: in all cases the ration BOD5:COD resulted lower than 0.5,
thus it can be expected that the substance is not readily biodegradable
(BASF SE, 2014).
Additional information are given from two
Zahn Wellens tests, performed according to the OECD 302B. One of them
indicates a biodegradation of 24 % after 28 days (Ciba-Geigy Ltd.,
1992): this value is obtained at about the fifth day, afterwards the
degradation process seems to stop. The slope of the 28 days curve and
the second test of inherent biodegradation (Novartis Services AG., 1997)
reported suggest that the 24 % of DOC removal recorded in the first test
can still be related to a slow adsorption process more than a biological
In conclusion, the substance is considered
as neither readily nor inherently biodegradable.
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