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Environmental fate & pathways

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If 2 -butoxyethanol is present in ambient air, it is expected to exist almost entirely in the vapour phase, based on the physicochemical properties cited in chapter 4. 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 reasonably fast rate, with an estimated half life of 3 to 33 hours (with most estimates at the lower end of this range) at an OH concentration of 1.5million OH/cm3 and a 12 hour day). A figure of 12 (0.5day) is used for the key parameter. 2 -butoxyethanol is considered resistant to hydrolysis. There is no data available on phototransformation in water or soil.