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Diss Factsheets

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Information on bioaccumulation is not available and a test does not need to be conducted as direct or indirect exposure of the environment is not expected.

Key value for chemical safety assessment

Additional information

According to REACH Regulation Annex IX 9.3.2. column 2, a study on Bioaccumulation in aquatic species need not be conducted, if direct and indirect exposure of the aquatic compartment is unlikely.

ZINN(II)-RICINOLEAT is manufactured outside the EU.

The substance is used as a catalyst in the manufacture of flexible polyurethane (PU) foam. The substance catalyses the gelling reaction of the polyol and isocyanate to form urethane. The catalytic active part of the substance is the Sn2+ ion which is formed by dissociation of the substance due to water vapour which occurs due to the high temperatures (> 150 °C) during foaming. Finally atmospheric oxygen reacts with the Sn2+ to form SnO, which is incorporated in the Polyurethane foam matrix. Fatty acid anions react with isocyanate and are bound into the polymer matrix.  Therefore the substance does not act like a "common" catalyst which is unchanged after the reaction, but it dissociates during catalysis irreversibly, both dissociation products react with the educts of the polymerisation and therefore cannot be separated from the polyurethane matrix.

In conclusion, direct and indirect exposure of the aquatic compartment is unlikely and therefore the conduct of a bioaccumulation study is considered as not being required. In addition this argumentation is supported by taking into account the relatively low water solubility of 12 mg/L and the readily biodegradability of the substance.

For determination of classification and labelling for the environment a log Kow of ≥ 4 was taken into account. As a consequence, the unrealistic assumption of bioaccumulation for the substance would not have any influence on classification.

Furthermore for PBT assessment bioaccumulation was respected as a worst case scenario, howeverin contact with air or water containing oxygen, the Tin(II) -compound will be oxidised to the Tin(IV) -compound within hours-days forming insoluble SnO2. The inorganic SnO2 is not expected to bioaccumulate.