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Environmental fate & pathways

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One experimental study according to OECD 301C confirmed that 2-(1-methylethoxy)ethyl acetate (CAS 19234-20-9) is not readily biodegradable according to the OECD criteria (41% biodegradation after 28 d). Considering the high water solubility (99.8 g/L) and the low potential for adsorption to organic soil and sediment particles (log Koc: 1 - 1.47, KOCWIN v2.00), the main compartment for environmental distribution is expected to be the surface water. The degradation via abiotic hydrolysis is not considered to be a relevant degradation pathway in the environment since QSAR results using HYDROWIN v2.00 resulted in DT50 values > 24 h at pH 7. Since the substance is not readily biodegradable, persistence in the water phase cannot be excluded. Evaporation from the water phase into air is not expected to be relevant based on the low Henry’s Law constant (< 1 Pa m³/mole (HENRYWIN v3.20); Corti, 2011). Based on the vapour pressure of 700 Pa the substance shows potential for volatilization. However, if released into air, 2-(1-methylethoxy)ethyl acetate is susceptible to undergo rapid indirect photodegradation by OH-radicals with a DT50 value of 18.29 h (AOPWIN v1.92). Therefore, the potential for accumulation in air and the subsequent transport to other environmental compartments is low. The potential for bioaccumulation of 2-(1-methylethoxy)ethyl acetate is assumed to be low based on the log Kow of 1.28.