Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

There are no toxicity data for soil organisms relating to 2-octyldodecan-1-ol or other long chain alcohols >=C16 in length.

In Annex X of Regulation (EC) No 1907/2006, it is laid down that long-term toxicity to terrestrial organisms shall be proposed by the registrant if the chemical safety assessment indicates the need to investigate further the effects of the substance and/or relevant degradation products on terrestrial organisms. Column 2 of Annex X states that studies do not need to be conducted if direct and indirect exposure of the soil compartment is unlikely.

The test substance is not supposed to be applied directly to soil. Indirect exposure to soil via sewage sludge transfer is unlikely since the substance is readily biodegradable.

Four reliable key studies are provided in the dossier as evidence for ready biodegradability of the Guerbet Alcohols (see CSR Section 4.1.2). Richterich (1998a and b) demonstrated that 2-hexyldecanol and 2-octyldodecan-1-ol fulfilled the 10-day window and are considered readily biodegradable. The OECD SIDS Initial Assessment Report for Long Chain Alcohols (2006) concludes that linear and essentially linear C6-22 alcohols are rapidly biodegradable especially at environmentally relevant concentrations.

Biodegradation of long-chain alcohols will not produce degradation products of concern, as reported in a study by Federle and Itrich (2006) where long chain alcohols rapidly decayed in water treatment processes. The half-lives of all the long chain alcohols tested were less than one minute and the removal in activated sludge plants of long-chain alcohols, such as hexadecanol, are reported to be 99.46%.

In the environment, ready biodegradability means it can be assumed that 2-octyldodecan-1-ol will be biodegraded within the STP process and as a consequence a transfer to the soil compartment via sewage sludge is not expected. 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. Therefore, no tests on terrestrial organisms are provided.