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EC number: 203-051-9
CAS number: 102-76-1
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.
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