Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

If 2 -(2 -(2 -butoxyethoxy)ethoxy)ethanol is present in ambient air, it is expected to exist almost entirely in the vapour phase. This substance is not expected to absorb UV light in the environmentally significant range of >290 nm and is not therefore expected to undergo direct photolysis on sunlit soil surfaces, in the atmosphere or in aquatic environments. However, modelling predicts that it is likely to undergo indirect photolysis through hydroxyl radical reaction at a fast rate, with an estimated half life of 2.5 hours (0.21 days) at an OH concentration of 1.5million OH/cm3 and a 12 hour day). Based on its chemical structure, the substance is expected to be hydrolytically stable under normal environmental conditions. It should be borne in mind that the vapour pressure is so low that transport to the atmospheric compartment is not an important fate mechanism.

In an OECD guideline closed bottle ready biodegradation test, 85% degradation was seen after 28 days when using a micro-organisms seed mixture of synthetic sewage micro-organisms and soil. This and other available studies suggest that there can be a significant time lag before degradation commences and only 26% degradation was seen in this particular study after 10 days of degradation starting. The substance is therefore readily biodegradable but fails to meet the 10 day window.