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Sediment toxicity

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Description of key information


Key value for chemical safety assessment

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According to REACH Regulation, Annex IX, Column 2 (Specific rules for adaptation from Column 1), sediment toxicity testing is not proposed by the registrant because the chemical safety assessment, according to Annex I, does not indicate the need to investigate further the effects on sediments.

Koc indicates in fact that the substance is likely to adsorb to particulate matter, therefore also to sediments, but exactly this property is used to remove the substance from the waste water within the plants and send the sludge to incineration. A number of studies on STP, and sludge can confirm that removal is enough complete not to effect the environment. As the Chemical Safety Assessment describes, the only scenario where a release in municipal can be expected is the domestic use of the substance in detergent formulations.

Concentrations and quantities involved in this use are negligible and below the level of risk calculated with the Equilibrium Partitioning method.

Calculated PNEC based on the measured log Koc of 4 is in fact 43.6 mg/Kg sediment. The predicted highest conservative value is around 11.59 mg/L (See Chemical Safety Assessment), while the monitored quantity of a member of the Stilbene Fluorescent Whitening category according to Stoll 1997 is of maximum 0.5 mg/Kg sediment [1].

[1] HERA Report 2004: Substance: Fluorescent Brightener FWA-1 (CAS 16090-02-1)