Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

If 2 -(2 -(2 -methoxyethoxy)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 3.2 hours (0.27 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.

In a guideline study, the substance 2-(2-(2-methoxyethoxy)ethoxy)ethanol was found to be readily biodegradable and met the 10 day window. Full degradation occured within 13 days. The biodegradation of 2 -(2 -(2 -methoxy)ethoxy)ethoxyethanol was assessed using a non-adapted domestic sewage innoculum in a freshwater medium. Ready degradation was observed. Since the degradation exceeded 60% within 20 days, the substance meets the criteria for classification as readily biodegradable. However, in this study, the substance did not meet the 10 day window. Based on the results of these studies, the substance meets the criteria to be classified as readily biodegradable.