Registration Dossier
Registration Dossier
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EC number: 273-468-9 | CAS number: 68971-49-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Under test conditions no biodegradation observed
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
Ready biodegradation was tested on the substance under registration in Closed Bottle Test (OECD 301D). Under test conditions no biodegradation was observed. The original report is not more available and many details are missed (Bayer AG., 1987). Nevertheless, existing information in the form of summaries reporting data about BOD5 and inherent biodegradation. The Zahn Wellens study reports a variation in the DOC in the first 5 days of about 76 %, afterwards no or negligible degradation was observed (Ciba-Geigy Ltd., 1995). The existing BOD5 measurements (Ciba-Geigy Ltd., 1990 and Ciba-Geigy, 1995) indicate respectively no oxygen consumption and 10 % oxygen consumption in the first 5 days, supporting the hypothesis that the DOC removal in the first 5 days is not related to biodegradation process, but to a slow adsorption process.
The same behaviour was observed in the similar substance of the Stlbene Fluorescent Whitening Agents OB 3a-MSA, the analogue dihydroxyethylamino derivative tetrasulphonated, for which the related data are here reported.
In a ready biodegradation test, performed according to OECD guideline 301A, a DOC removal of 1.2 % was observed (Ciba-Geigy Ltd., 1992). Hence, the substance OB 3a-MSA is considered not readily biodegradable. BOD5 tests, in which no oxygen consumption was measured, confirm the non rapid biodegradability of the test substance (“Summary” BASF SE, 2014). Additional information are given from two Zahn Wellens tests (OECD 302B): in one case a biodegradation of 24 % after 28 days was indicated (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 degradation.
In conclusion, the substance can be considered as neither readily nor inherently biodegradable.
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