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EC number: 217-568-2
CAS number: 1889-67-4
The purpose of this study was to determine
the ready biodegradability of
1,1'-(1,1,2,2-tetramethylethylene)dibenzene. The test item was exposed
to activated sludge from the aeration tank of a domestic waste water
treatment plant for 28 days in accordance to OECD TG 301D, Regulation
(EC) No 440/2008 Method C.4-E and EPA OPPTS 835.3110. The biodegradation
was followed by the oxygen uptake of the microorganisms during exposure.
As a reference item sodium benzoate was tested simultaneously under the
same conditions as the test item, and functioned as a procedure control.
Under the test conditions the percentage biodegradation of the test item
reached a mean of 0.2 % after 28 days based on ThODNH4. Therefore, the
test item is considered to not be ready biodegradable. The reference
item sodium benzoate was sufficiently degraded to a mean of 77.8 % after
14 days, and to a mean of 86.9 % after 28 days of incubation, based on
ThODNH4, thus, confirming the suitability of the used activated sludge
inoculum. In the toxicity control containing both, the test item and the
reference item, a mean of 27.0 % biodegradation was noted within 14 days
and 33.3 % biodegradation after 28 days of incubation. Thus, the test
item can be assumed to not inhibit the activated sludge microorganisms.
Under the test conditions the percentage
biodegradation of the material reached a mean of 0.2 % based on ThODNH4.
Thus, the test item has to be considered as not ready biodegradable.
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