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Environmental fate & pathways

Phototransformation in air

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Description of key information

Determination of a photolysis rate of EUF or its hydrolysis products seems scientifically not justified

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Additional information

The molecular structures of EUF components have no chromophore. In addition, the UV spectrum of EUF does not show any absorption of light with wave-lengths > 230 nm. Substances without significant UV/absorption > 290 nm cannot undergo direct photolysis in sunlight. EUF has a UV absorption maximum < 230 nm and therefore no direct photolysis in the atmosphere is expected.
The vapour pressure of several constituents was estimated to be in the range between 2.21∙10-6 Pa and 8.6 Pa at 25°C indicating that some of the constituents of the reaction mixture are slightly volatile (> 0.01 Pa). Therefore, photodegradation in air could be relevant. However, the partial pressures are expected to be relatively low. Moreover, due to hydrolysis most of theses substances are not stable as pure substance and thus it is expected that these substances are also not stable in air. Overall, degradation by photolysis in the atmosphere is considered to be only of minor importance, as no significant volatilisation of EUF constituents is expected. Information on the behaviour in air for the hydrolysis products formaldehyde and ethylene glycol (see below) are assumed to be scientifically sufficient.