Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

One experimental study according to OECD 301 confirmed that 2,2-bis[[(1-oxoisononyl)oxy]methyl]-1,3-propanediyl diisononanoate (CAS 93803-89-3) is persistent according to the OECD criteria (6% biodegradation after 60 d). 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 values > 1 yr at pH 7. 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. Considering the low water solubility (< 0.05 mg/L) of 2,2-bis[[(1-oxoisononyl)oxy]methyl]-1,3-propanediyl diisononanoateand the potential for adsorption to organic soil and sediment particles(log Koc: >5 KOCWIN v2.00),the main compartment for environmental distribution is expected to be the soil and sediment. The Guidance on information requirements and chemical safety assessment, Chapter R7.b (ECHA, 2012) states that once insoluble chemicals enter a standard STP, they will be extensively removed in the primary settling tank and fat trap and thus, only limited amounts will get in contact with activated sludge organisms. Nevertheless, once this contact takes place, these substances are expected to be removed from the water column to a significant degree by adsorption to sewage sludge (Guidance on information requirements and chemical safety assessment, Chapter R.7a, (ECHA, 2012). Thus, discharged concentrations of this substance (if at all) into the aqueous/sediment and soil compartment are likely to be low. Moreover, bioaccumulation of the substance is assumed to be lowbased on the molecular weight (MW 697.04) and physico/chemical properties such as low water solubility and high potential for adsorption a reduced availability in water is expected.

A detailed reference list is provided in the technical dossier (see IUCLID, section 13) and within the CSR.