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Environmental fate & pathways

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Data on experimental determination of hydrolysis in water is not available. However, based on physical-chemical properties of TAEE and the properties of other structurally related aliphatic ethers TAEE is not expected to significantly hydrolyse in natural waters under environmentally relevant pH conditions (pH 4-10).

In the troposphere TAEE is photochemically oxidised by hydroxyl radicals abstracting H atoms. The degradation half-life of TAEE in the air is 1.01 days depending on environmental conditions (predominantly OH-radical concentration). Using a degradation rate constant of 1.06E-11 cm3/molecule/2 and an OH-radical concentration of 5E05 radicals/cm3 a half-life of 1.51 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, TAEE is not expected to be photolysed directly. Significant photooxidation in water via reactions with photochemically produced hydroxyl radicals is unlikely to occur.

The abiotic degradation rate constants used in the assessment are listed in the following table:

Table: Overview of abiotic degradation rates

Degradation for hydrolysis

0 d-1

Degradation for photolysis

0 d-1

Degradation rate in air:

0.458 d-1