Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

2 -ethylhexyl benzoate (CAS No. 5444 -75 -4) is hydrolytically stable and therefore abiotic hydrolysis is not a relevant pathway in water. However, the substance is readily biodegradable and will rapidly be removed from natural water compartments as well as from wastewater in sewage treatment plants. The substance has a log Koc of 4.07 indicating potential to adsorb to soil and sediment particles. Calculated value for the Henry’s Law constant (25.6 Pa*m3/mol) suggest a gradual evaporation from the water surface into air. In the atmospheric compartment, the substance is susceptible to indirect photodegradation. The estimated half time for the reaction with OH-radicals is 33.4 hours (24h day; OH-concentration: 0.5E+06 OH/cm3).

Due to its low water solubility (0.4 mg/L in aqua bidest), ready biodegradability and considerable adsorption to soil and sediment particles (log Koc = 4.29), only low concentrations of 2-ethylhexyl benzoate are expected to be released into the aquatic environment. The substance will be bioavailable to aquatic organisms mainly via feed and contact with suspended organic particles. 2-ethylhexyl benzoate is not bioaccumulative, based on the criteria given in Regulation (EC) No. 1907/2006, Annex XIII, 1.1.2 (BCF < 2000 L/kg). After uptake by fish species, extensive and fast biotransformation of the substance by carboxylesterases into benzoic acid and the corresponding alcohol is expected. BCF/BAF values estimated with the BCFBAF v3.01 program, Arnot-Gobas model including biotransformation, also indicate that this substance will not be bioaccumulative.

 

In conclusion, 2-ethylhexyl benzoate is effectively removed from the environment by biotic and abiotic degradation processes. Due the low water solubility and high adsorption potential, the main route of exposure for aquatic organisms will be via food ingestion or contact with suspended solids. Ingested amounts of the substance in organisms are expected to be effectively metabolized to benzoic acid and the corresponding alcohol.