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Sediment toxicity

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Description of key information

The physico-chemical properties of 4-MHHPA, together with fugacity modelling, indicate that the substance is not expected to be distributed into sediment. As a result, the risk for this compartment is considered to be low and no information on effects on sediment–dwelling organisms is needed.

Key value for chemical safety assessment

Additional information

Results of sediment tests are not available. Modelling indicates that 4 -MHHPA will be highly mobile in water with negligible adsorption to sediment. It can be assumed that the outcome of tests through exposure to sediment pore water will not differ significantly from that arising through exposure in the overlaying water and, 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 4-MHHPA into the sewage is very limited, if not completely negligible, as the chemical is incorporated into a matrix during polymer manufacturing, In the unlikely case that 4-MHHPA 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 4-MHHPA will not be present in sewage sludge, will not be distributed to sediment and, direct or indirect exposures of the aquatic and terrestrial compartments are unlikely