Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

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-octyl-1-dodecanol 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, is reported to be 99.46%.

There is sufficient information available to indicate that 2-octyl-1-dodecanol is likely to adsorb to sediments and soils, for example, McCall (1981) classified 2-octyldodecanol with a Koc >5,000. Measured adsorption values for hexadecanol (Koc of 143,000) and octadecanol (Koc of 471,000) are presented in the SIDS SIAR Long Chain Alcohols Report (2006). In this CSR, the study by Bodsch (2009) reported a Log Koc of 8.92 for 2-octyldodecanol in soil with a corresponding Koc value of 8.4x108. For sewage sludge the Log Koc was determined to be 9.79 with a corresponding Koc of 6.2x109.

From these data it is expected that 2-octyl-1-dodecanol will be immobile in soils and sediment. However, while a substance may adsorb readily to sediment, sludge and soil, when it rapidly degrades, the availability of the substance to bind to substrates will be limited by degradation. In addition, where a substance does sorb to sediment or soil, the substance will be readily degraded as it desorbs.

In conclusion, the Guerbet Alcohol will be rapidly removed from the environment due to its ready biodegradability.