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EC number: 273-468-9 | CAS number: 68971-49-3
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
No biodegradation is expected in water and sediment simulation testing
Key value for chemical safety assessment
Additional information
A simulation study was performed according to OECD 303A on the substance under registration, for which a summary is available, indicating a percentage of TOC equal to 4 % (Ciba-Geigy Ltd., 1990).
The anaerobic degradation was evaluated on the analogous OB 3a-MSA, according to procedures outlined into the ECETOC Technical Report No. 28. The resulting degradation rates are different and the reason of this difference is not evaluable (Bayer AG., 1993 and Bayer AG., 2000).
A further field study at a full-scale STP on a similar substance in the category of the Stilbene Fluorescent Whitening Agents (OB 2 -A) gave no evidence of biodegradation when the mass flow was monitored (Poiger, 1994 – Section 5.5.2: Field studies).
In virtue of a conservative approach, it is assumed that the test substance under registration would be non biodegradable in simulation tests.
Considering all biotic degradation studies for the members of the category (see Category Reporting Document attached to Section 13 of the dossier), structural similarities, estimated and calculated data, metabolic previsions, it can be assumed that all members have the same behaviour in the biotic compartment.
Further biotic degradation testing shall be proposed only if the Chemical Safety Assessment, according to Annex I, indicates the need to investigate further degradation of the substance and its degradation products. Based on the Chemical Safety Assessment the exposure of sediment and soil will be negligible, since the substance and its formulations are produced and used in plants with internal Sewage Treatment Plant, where the sludge is sent to incineration.
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