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Sediment toxicity

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No experimental data evaluating the toxicity of Zinc O,O,O',O'-tetrabutyl bis(phosphorodithioate) to sediment organisms are available. According to the standard requirements set in Regulation (EC) No. 1907/2006, Annexes VII, VIII and IX, information regarding the effects of the substance on sediment organisms does not need to be presented at this tonnage band (100-1000 t/y). Nevertheless, since the substance is classified as toxic for aquatic organisms, an assessment of the potential hazard of Zinc O,O,O',O'-tetrabutyl bis(phosphorodithioate) to sediment dwelling species is performed as well. According to Annex X, Column 2, 9.5.1, of Regulation 1907/2006, long-term toxicity testing shall be proposed by the registrant if the results of the chemical safety assessment indicate the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms. The environmental exposure assessment performed for this substance (see CSR attached to IUCLID section 13) shows that indeed the Risk Characterization Ratio (i.e. PEC/PNEC ratio) in the sediment compartment is < 1 and therefore, under the current exposure conditions, Zinc O,O,O',O'-tetrabutyl bis(phosphorodithioate) does not pose a risk to sediment organisms and further testing is not deemed necessary according to Regulation (EC) No. 1907/2006, Annex XI, section 3.