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Sediment toxicity

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Description of key information

In accordance with REACH Regulation 1907/2006, Annex X, Column 2, long-term toxicity tests to sediment organisms do not need to be conducted as the results of the chemical safety assessment do not indicate the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms.

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In accordance with REACH Regulation 1907/2006, Annex X, Column 2, long-term toxicity tests to sediment organisms do not need to be conducted as the results of the chemical safety assessment do not indicate the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms. The physico-chemical properties of the substance, together with fugacity modelling, indicate that it is not expected to be distributed into sediment. In view of this predicted lack of adsorption/accumulation in sediment it can be assumed that, in such tests, exposure through sediment pore water will not differ significantly from that in the overlaying water. As a result, hazards resulting from uptake of sediment can be excluded. Furthermore, there is no wide dispersive use as the chemical is only used in industrial processes. From industrial processes, the release of trimellitic anhydride into sewage is very limited, if not completely negligible, as the chemical is incorporated into a matrix during polymer manufacturing. In the unlikely case that trimellitic anhydride will reach sewage the anhydride group, which represents the single reactive and toxic functional moiety, rapidly hydrolyses to the respective di-acid. Overall, it is expected that trimellitic anhydride or its hydrolysis product trimellitic acid will not be present in sewage sludge, will not be distributed to sediment and, as a result, direct or indirect exposure of the sediment compartment is unlikely.