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Environmental fate & pathways

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Several studies on the biodegradability in water are available on similar substances within the Stilbene Fluorescent Whitening Agents category (see Justification Category Report attached to the section 13). For all tested members of the category no biodegradation was observed, neither readily, neither inherently. As a consequence, OB 3c-MSA can be considered as neither readily nor inherently biodegradable.

Anaerobic degradation can happens, but it is not a main degradation pathway and results seem in disagreements.

A field study at a full-scale STP on the analogous substance OB 2 -A (Poiger, 1994) gave no evidence of biodegradation when the mass flow was monitored. It is assumed that the test substance would be non biodegradable in soil and sediment either.