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Ecotoxicological information

Endpoint summary

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Additional information

There are no toxicity data for soil organisms relating to 2-butyloctanol or other long chain alcohols.

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. 

Read-across from Guerbet Alcohols and LCA categories has been used to meet the data gap for the 2-butyloctanol biodegradation endpoint, as described in the ‘Read Across Justification Document’ section 13. Experimental data and published literature are available for linear and Guerbet alcohols. A ready biodegradation study by Federle (2009) tested 10 linear primary alcohols from butanol (C4) to docosanol (C22) and concluded that all 10 LCAs are readily biodegradable and satisfy the 10-day criterion.

It is concluded that given the very close similarity between C6-C22 LCAs (both linear and Guerbet) as well as similar physico-chemical properties and structure, it is fully expected that the C12 LCA, 2-butyloctanol will also be readily biodegradable. Indirect exposure is not expected as rapid biodegradability means 2-butyloctanol will be biodegraded within the STP process and as a consequence a transfer to the soil compartment via STP effluent is not expected. 2-Butyloctanol will not be directly applied to soils and as such, direct exposure to soil organisms is not expected. Therefore, no tests on terrestrial organisms are provided.