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Diss Factsheets

Ecotoxicological information

Sediment toxicity

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Administrative data

Link to relevant study record(s)

Description of key information

The EPM strategy that we applied to sediment follows the rules set out in the integrated testing strategy (ITS) detailed in R.7.8.14, Chapter R.7b of the ECHA Guidance on information requirements and chemical safety assessment (v3.0, Feb. 2016, pp.157 -158). No adequate toxicity datum is available for toxicity of the substance to sediment organisms. Therefore, both freshwater and marine sediment PNECs were derived from their respective aquatic PNECs, using the EPM method. The subsequent calculated RCRs are all inferior to 1 for both compartments and no further testing is therefore required to cover the risk for both sediment compartments. This information is presented in the CSA. It has to be noted that both octanol-water partition (log Kow) and adsorption (log Koc) coefficients are inferior to 3. Consequently, a chemical safety assessment for the sediment compartment was not mandatory, as stated in R.7.8.7, Chapter R.7b of the ECHA Guidance on information requirements and chemical safety assessment (v3.0, Feb. 2016, p.159): “ The main property of a substance that triggers the assessment for the sediment compartment is the potential to adsorb or bind onto sediment. [...] A log Kow of 3 should be used as trigger value for a sediment assessment.”. However, a chemical safety assessment is yet provided. It indicates an acceptable risk (all RCRs < 1) for both sediment compartments (both freshwater and marine).

Key value for chemical safety assessment

Additional information

An unreliable toxicity study for sediment-dwelling organisms relating to the test substance is available and included in the dossier. 


Torp (1997) conducted a (Klimisch 3) GLP compliant study following methods based on OSPAR 1995Protocols on Methods for the Testing of Chemicals Used in the Offshore Oil Industry, Part A: A sediment bioassay using a amphipod, Corophium sp.  Adult Corophium volutator were exposed to sediment spiked with the test substance at nominal concentrations of 20, 54, 163, 514, 1592, 4996 (mg/kg dry sediment weight) for 10 days. At the end of the test, control mortality was 3%. The 10 day LC50 was 1260 mg/kg dry weight. Although this study is considered not reliable, it is included for comparison. PNECsediment is calculated based on koc and equilibrium partitioning coefficient method.


In accordance with REACH Regulation 1907/2006, Annex X, Column 2, studies of the effects on sediment organisms need not be conducted if exposure assessment indicates no concern for exposure to environmental compartments. The substance is not expected to adsorb to sediment or soil as the log kow is low (2.51). Additionally, reliable model results indicate that the adsorption coefficient is low (Log Koc of <3), indicating low adsorption potential. No significant exposure of the sediment compartment is therefore expected and additional information on the effects of the substance and its degradation products on soil micro-organisms are therefore not required.