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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

No biodegradation is expected in water and sediment simulation testing

Key value for chemical safety assessment

Additional information

The anaerobic degradation was evaluated on the analogous substance OB 3a-MSA, according to procedures outlined into the ECETOC Technical Report No 28. The resulting degradation rates are different: the reason of this difference is not evaluable.

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. IUCLID section 5.5.2).

In virtue of a conservative approach, it is assumed that the test substance under registration (OB 1-MSA) would be non biodegradable in simulation tests.

Considering all biotic degradation studies for the members of the category (see Category Reporting Document attached to the section 13 of the technical 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 for paper application and used in plants with internal Sewage Treatment Plant, where the sludge is sent to incineration.

No further tests on biodegradation on water and sediments are proposed.