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Environmental fate & pathways

Phototransformation in air

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Description of key information

Data are available for the read-across substance TAME. Based on study data available, TAME is indirectly photodegraded in the atmosphere in few days. The estimated degradation half life is 3.07 days.

Key value for chemical safety assessment

Additional information

Based on the considerations described in the document “Read-across substantiation C5-6 branched alkylmethyl-ethers” (incl. the supporting references Tuppurainen et al., 2007 and Niska et al., 2008), it can be concluded that the available information of TAME can be used to predict the phototransformation in air of the substance ‘C5-6 branched alkylmethyl-ethers’ with sufficient certainty.

According to existing data, degradation half-life of TAME in the air is 2.55-3.07 days depending on environmental conditions (predominantly OH-radical concentration). Using a degradation rate constant of 5.22 · 10-12cm3/molecule/s and OH –radical conc. 5 · 105radicals/cm3a half-life 3.07 days is calculated. This half-life for degradation in air will be used in further assessment.