Registration Dossier
Registration Dossier
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EC number: 211-309-7 | CAS number: 637-92-3
Endpoint summary
Administrative data
Description of key information
Additional information
Both TAME and MTBE are not expected to hydrolyse under environmentally relevant pH conditions (pH 4-10) based on their physical-chemical properties and the properties of other structurally related aliphatic ethers (Lyman et al., 1982; Prager, 1992). Since ETBE is structurally highly related to both substances it can be expected that also ETBE will not significantly hydrolyze in natural waters.
According to existing data, degradation half-life of ETBE in the air is 3-12 days depending on environmental conditions (predominantly OH-radical concentration).
Using a degradation rate constant of 3.0E-12 cm3/molecule/s and an OH –radical concentration of 5E05 radicals/cm3 a half-life of 5.35 days is calculated (Bennett and Kerr, 1990).
Direct photolysis will not be an important removal process since aliphatic ethers do not absorb light at wavelengths >290 nm. The UV-spectrum (max at 289 nm) indicates that direct photolysis in water may not occur.
The abiotic degradation rate constants used in the assessment are sumamrised in the following table:
Degradation for hydrolysis |
0 d-1 |
Degradation for photolysis |
0 d-1 |
Degradation in air |
0.130 d-1 |
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