Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

According to a Mackay Level I model calculation, the main target compartment for tridecanedioic acid will be the hydrosphere (75.4 %) followed by sediment (12.3 %) and soil (12.2 %). It is expected that dissociation in the water phase will further increase its share significantly at the expense of the other compartments. The calculated Henry’s Law constant of 0.0000023 Pa m³/mol at 20 °C indicates very low volatility of tridecanedioic acid from surface waters. With a log Koc of 2.1 l/kg, a „very low“ sorption potential of the substance to soil or sediment organic matter is expected (Blume scale).

 

The QSAR calculated rate constant for the OH sensitized photodegradation of tridecanedioic acid is approximately 15.4807E-12 cm3/(molecule * s). At 500,000 OH radicals / cm3 (typical for central Europe), this corresponds to a half-life of 25 hours. Hydrolysis under environmental conditions can be excluded based on structural considerations. Ready biodegradability was confirmed. Biodegradation is expected to be the main mechanism of removing tridecanedioic acid from the environment.

 

The partition coefficient 1 -octanol/water was determined as log Kow = 3.0 at 25 °C, indicating a moderate potential for bioaccumulation. This potential is further reduced by dissociation in the aqueous phase as reflected in the QSAR BCFWIN.