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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

A simulation study according to OECD 303A has been performed for which a summary is available, indicating a %TOC of 4%.

The anaerobic degradation has been evaluated on the analogous substance CAS 16470 -24 -9, according to procedures outlined into the ECETOC Technical Report No. 28 and degradation rates are ranging from about 10 to 78 %. It is assumed that the test substance would be non biodegradable in simulation tests. A field study at a full-scale STP on a similar substance in the category of the Stilbene Fluorescent Whitening Agents (CAS 16090-02-1) gave no evidence of biodegradation when the mass flow was monitored. (Poiger 1994 – Section 5.5.2: Field studies).

Considering all biotic degradation studies for the members of the category (See Category Reporting Document in section 13), structural similarities, estimated and calculated data, metabolic previsions, it can be assumed that all members have the same behaviour in the biotic compartment.

It is assumed that the registering substance in category are not biodegradable in simulation tests either.

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 mainly for paper applications and used in plants with internal Sewage Treatment Plant, where the sludge is sent to incineration.