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Environmental fate & pathways

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The substance is not expected to biodegrade. Biodegradation of a structural analogue (DNNSA) was shown to be 14 -17% at maximum in a test for ready biodegradability. Based on the structure no hydrolysis under environmental conditions was predicted.

The bioaccumulation of the substance was assessed by using a validated QSAR model. Supporting evidence for the low bioaccumulation potential can be seen in the molecular weight (984.8 Da) and the size of molecule (Dmax > 19 Angstroms). Molecules of this size are generally considered to have low bioaccumulation potential due to their reduced uptake and low membrane permeability (Guidance on information requirements and chemical safety assessment Chapter R.11: PBT Assessment).

In accordance with REACH guidance indicating that “Estimated values are essential for substances for which experimental measurement is not feasible i.e. for "difficult substances”, the log Koc for Zinc DNNSA that will be used for the environmental assessment will be 5.10, the average of the 2 values estimated by modeling.