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Environmental fate & pathways

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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 stability of the substance ‘C5-6 branched alkylmethyl-ethers’ with sufficient certainty.

Based on physical-chemical properties of TAME and the properties of other structurally related aliphatic ethers, TAME is not expected to significantly hydrolyse in natural waters under environmentally relevant pH conditions (pH 4-10) (Prager 1992).

 According to existing data, the 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 -12 cm3/ molecule.s-1 and an OH-radical concentration of 5E05 radicals/cm3 a half-life of 3.07 days is calculated. This half-life for degradation in air will be used in further assessment.

Data on experimental determination of photolysis in water is not available. However, because of structural reasons, TAME is not expected to photolyse directly, or photooxidise significantly via reactions with photochemically produced hydroxyl radicals in water.


The rate constant used in the assessment are:

Degradation for hydrolysis

0 d-1

Degradation for photolysis

0 d-1

Degradation in air

0.226 d-1