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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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No experimental simulation tests evaluating the potential of Zinc O, O, O', O'-tetrabutyl bis(phosphorodithioate) (CAS 6990-43-8) to degrade in surface waters/sediments are available. However, a simulation test would provide little additional data as the worst case for persistence (vP) was already established in an OECD 301B test (see chapter 5.2.1 of the technical dossier). Therefore, simulation tests would provide little additional knowledge. Taking all available information into account, this substance is not considered to be a PBT candidate (for further information please see chapter 2.3 of the technical dossier –PBT assessment). Furthermore, the Chemical Safety Assessment indicates a PEC/PNEC ratio below 1 for surface waters/sediment. Consequently, no risk for this compartment is indicated. Considering all available information as stated above, further simulation tests for surface waters/sediment are thus omitted.