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Sediment toxicity

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As SAS is readily biodegradable and not strongly adsorptive to solids, e.g. sediment, exposure of sediment is limited. According REACH Regulation 2006/1907/EEC, Annex X, 9.4, column 2, sediment effects studies need only to be carried out if direct and indirect exposure is indicated by the chemical safety assessment. As demonstrated in the CSR chapters 9 and 10, sediment exposure and risk is very low.

Nevertheless a 3-day chronic nematode study was carried out resulting in a NOEC reproduction of 939 mg/kg dw. Based on this NOEC a PNEC freshwater sediment of 9.4 mg/kg dw (a.i.) was calculated and can be compared with the PNEC freshwater sediment equil. partit. of 2.9 mg/kg dw based on aquatic effect data.

Key value for chemical safety assessment

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