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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Biodegradation test data indicate that the registered substance, reaction products of 1-decene, 1-dodecene, and 1-octene, hydrogenated is readily biodegradable (e.g., >60% biodegradation in 28 days) but does not meet the 10-day window in standard OECD ready biodegradability test guidelines.  In addition, there are experimental supporting data indicating that two of the main components, 1-decene dimer, hydrogenated (CAS No. 68649-11-6) and 1-decene dimer with dodecene dimer, hydrogenated (CAS No. 151006-58-5) as well as other structurally related polyalphaolefin (PAO) materials [in the ~ 2.8 cst viscosity and ~C24 carbon-number range] are also readily biodegradable (greater than 60% in 28 days, see table above) but do not meet the 10-day window.  In accord with ECHA-REACH guidelines, the test substance, the reaction products of 1-decene, 1-dodecene, and 1-octene, hydrogenated, is considered “readily biodegradable” since it consists of a mixture of homologous or isomeric components in which the 10-day window is not applicable [see pg. 177 of ECHA Guidance on Information Requirement and Chemical Safety Assessment, Chapter R.7b (ECHA 2008a) and pg. 8 of the OECD Guideline for Degradation Testing (OECD 2006)].  As determined by ECHA, materials that are readily biodegradable in freshwater are expected to be rapidly biodegraded in other environmental compartments (ECHA Guidance, Chapter R.7b).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In accord with ECHA-REACH guidelines, the reaction products of 1-decene, 1-dodecene, 1-octene, hydrogenated is considered “readily biodegradable” since it consists of a mixture of homologous or isomeric components in which the 10-day window is not applicable [see pg. 177 of ECHA Guidance on Information Requirement and Chemical Safety Assessment, Chapter R.7b (ECHA 2008a) and pg. 8 of the OECD Guideline for Degradation Testing (OECD 2006)]. As determined by ECHA, materials that are readily biodegradable in freshwater are expected to be rapidly biodegraded in other environmental compartments.