Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

The environmental hazard assessment for (fresh-)water organisms and sediment habitats is supported by several acute studies (pelagic compartment) as well as long-term studies for most trophic levels. For the environmental hazard assessment of the test item acute toxicity studies for freshwater fish, daphnids, freshwater algae and STP microorganisms are available. Long-term studies for a read across substance (C16-18 Tallow alcohol sulfate) for fish and daphnids are available. Experimental information about toxicity on marine organisms is not available. The short-term EC50/LC50 values for fish, daphnia and algae were 10.1, > 100 and > 76 mg/L, respectively. The fish were the most sensitive trophic level with an acute LC50 of 10.1 mg /L. This value will be used as worst case scenario for the risk assessment of aquatic organisms.

STP microorganisms showed no toxic effects at 312.5 mg/L as determined in an OECD 209 test. The registered substance has a log Pow < 3 resulting in a low likelihood to partition to sediment. The Koc value of the substance (anionic surfactant) indicates, that the substance exhibits reduced mobility, i.e. that it does adsorb rather strongly to soils or sediments. Furthermore, the substance is readily biodegradable and hence, contamination of environmental compartments like surface waters, sediment, soil and groundwater via horizontal and vertical transport is not expected. Additionally the test substance is not supposed to be directly applied to soil and an indirect exposure to soil via sewage sludge transfer is unlikely.

The test substance is readily biodegradable and not toxic to activated sludge in sewage treatment plants (see IUCLID dossier chapter 5.2.1 and 6.1.7). Therefore, after release to a sewage treatment plant, the substance is degraded to a significant extent. Consequently, an exposure of terrestrial organisms is negligible and testing not necessary. The PNECs for these endpoints will be calculated using the partition coefficient method. The justification to use read-across data from supporting substances is provided in Section 13 of the IUCLID dossier.