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Sediment toxicity

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In accordance with REACH Regulation (EC) 1907/2006, Annex X, Section 9.5.1, Colum 2, the toxicity testing to sediment organisms shall be proposed depending on the results of the chemical safety assessment. According to Annex I of this regulation, the chemical safety assessment triggers further action when the substance or the preparation meets the criteria for classification as hazardous according to Regulation EC 1272/2008 and its second adaptation 286/2011 or is assessed to be a PBT or vPvB. The hazard assessment of the substance reveals neither a need to classify the substance as dangerous to the environment, nor is it a PBT or vPvB substance, nor are there any further indications that the substance may be hazardous to the environment.


In addition, indirect exposure to sediment is unlikely since the substance is readily biodegradable according to OECD criteria. For substances being considered as „readily biodegradable“, it can be assumed that they will be completely biologically degraded within the STP process. Indirect exposure to sediment is not likely e.g. via agricultural use of sewage sludge since diethanolamine is readily biodegradable (see IUCLIC Ch. 5.2.1, BASF AG, 1992). Furthermore, for substances not passing the STP-process but being readily biodegradable, it can be assumed that they will be also biological degraded in the surface water within a short time. Direct exposure to sediment is not likely, since the substance is not intentionally applied to sediment. The substance has no potential to bioaccumulate (BCF = 2.7 L/kg considering all mitigating factors (9.2 L/kg not considering any mitigating factors), BCF baseline model v.04.11 (OASIS Catalogic v5.14.1.5) (BASF SE, 2021)).


Regarding the charged molecule at pH 7 the log Koc was estimated to be 0.99 (Koc = 10 L/kg) following the method of Franco & Trapp, 2008, 2009, 2010 (BASF, 2021). Therefore adsorption to solid soil phase is not expected (log Koc < 3).


In conclusion no testing is required. And no tests on sediment toxicity are provided.
The predicted no effect concentration (PNEC) for sediment was derived from the PNEC for freshwater using the equilibrium partitioning method.