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Environmental fate & pathways

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One experimental study according to OECD 301B confirmed that triacetin (CAS 102-76-1) is readily biodegradable according to the OECD criteria (76-82% biodegradation after 28 d). Therefore, the substance will not be persistent in the environment. 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 > 24 h at pH 7/pH8. Considering the high water solubility (58 g/L) and the low potential for adsorption to organic soil and sediment particles (log Koc: 1.61, KOCWIN v2.00), the main compartment for environmental distribution is expected to be the water body. Nevertheless, persistency in this compartment is not expected since the substance is readily biodegradable and it will be therefore ultimately degraded in sewage treatment plants. Evaporation into air and the transport through the atmospheric compartment is not expected since triacetin is not volatile based on the low vapour pressure (0.3306 at 25 °C). Accumulation in air and the subsequent transport to other environmental compartments is not anticipated. However, if released into air, the substance is susceptible to indirect photodegradation by OH-radicals with a DT50 of 45.31 h (AOPWIN v1.92). The potential for bioaccumulation of triacetin is assumed to be low based on the low log Kow of 0.25.