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Environmental fate & pathways

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Several studies on the biodegradability in water are available on the substance under registration and on several members within the Stilbene Fluorescent Whitening Agents category (see Justification Category Report attached to section 13). For all the tested members of the category no biodegradation was observed, neither readily, neither inherently.

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 2 -A (Poiger 1994) gave no evidence of biodegradation when the mass flow was monitored. Furthermore, a simulation study was performed according to OECD 303A for which a summary is available: results indicate a %TOC of 4 %.

It can be assumed that the test substance would be non biodegradable in soil and sediment either.