Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

One biodegradation study performed according to OECD 301B showed that Glycerides, C8-18 and C18-unsatd. mono- and di-, acetates (CAS No. 91052 -13 -0) is not readily biodegradable according to OECD criteria. The degradation via abiotic hydrolysis is not considered to be a relevant degradation pathway in the environment since QSAR results using SPARC v.4.6 and HYDROWIN v2.00 resulted in DT50 values > 1 yr at pH 7. Therefore, persistence of this substance in the environment cannot be excluded.

Evaporation into air and the transport through the atmospheric compartment is not expected since the substance is not volatile based on the low vapour pressure of <0.00045 Pa at 25 °C. However, if released into air, the substance is susceptible to indirect photodegradation by reaction with OH-radicals with a DT50 ranging from 15.9 h to 18 h (AOPWIN v1.92).

The adsorption potential of Glycerides, C8-18 and C18-unsatd. mono- and di-, acetates is high (log Koc range from 3.7 to 4.8, KOCWIN v2.00). Hence, soil and sediment are expected to be the main targets for environmental distribution.

The bioaccumulation potential of Glycerides, C8-18 and C18-unsatd. mono- and di-, acetates is expected to be low. Due to its log Koc value of > 3, significant adsorption of this substance to activated sludge in conventional STPs will take place and only low concentrations are expected to be released (if at all) into the environment. Once present in the aquatic compartment, the substance will be bioavailable to aquatic organisms partially via water and partially via feed and contact with suspended solids. Nevertheless, absorbed molecules of the substance will be metabolized. BCF/BAF values estimated by QSAR (BCFBAF v3.01) also support this assumption (BCF values 9.44-12.3 L/kg).