Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

In the atmosphere a half-life of 0.40 days for 2-[2-(2-hydroxyethoxy)ethoxy]ethyl 2-hydroxyethyl phthalate , the representative of this UVCB-substance is estimated due to indirect photolysis with hydroxyl radicals, considering an OH-concentration of 500,000 radicals/cm³ as a 24-h average (Currenta, 2010).

Key value for chemical safety assessment

Half-life in air:
0.4 d

Additional information

As no data on phototransfromation in air are available, the rate constant for the atmospheric gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals is estimated with the Atmospheric Oxidation Program (AOPWIN) of US Environmental Protection Agency. The rate constant is then used to calculate the atmospheric half-life. A 24-hour day and an OH radical conc. of 500,000 OH/cm³ are assumed for calculation. The substance is an UVCB-substance, as representative 2-[2-(2-hydroxyethoxy)ethoxy]ethyl 2-hydroxyethyl phthalate was used for calculation of the phototransformation in air.