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According to Annex X long-term toxicity tests for sediment organisms shall be proposed if the result of the Chemical Safety Assessment (CSA) indicates the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms. The need to conduct testing may be triggered when PEC/PNEC >1 based on Equilibrium Partitioning Method (EPM); for molybdenum, the PEC << EPM-based PNEC, and therefore no experimental test data are required. Note that the PNEC includes already an assessment factor of 3, and that the difference between PEC and EPM-based PNEC is more than one order of magnitude.

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