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Environmental fate & pathways

Biodegradation in water: screening tests

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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

Several studies on the biodegradability in water are available on the category of Stilbene Fluorescent Whitening Agents and none of the substances is neither readily nor inherently biodegradable in the available studies. The complete overview of the category is reported in the Category Justification Report attached to the point 13 of this dossier.

An inherently biodegradation test according to Zahn Wellens method was performed on the substance under registration (CAS 28950-61-0) and indicates that the test substance was presumably not biodegraded (DOC removal, mean values in the range from -1 to 4 %) (Seyfried B., 2008).

The result is in agreement with the estimation made using BIOWIN 4.10 on the substance in itself.

The most representative studies on ready and inherently biodegradation on analogous substances are also reported in a weight of evidence approach.