Registration Dossier
Registration Dossier
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EC number: 203-972-6 | CAS number: 112-44-7
Endpoint summary
Administrative data
Description of key information
For a summary of the most essential information, please see IUCLID endpoint summary section "Additional information" below.
Additional information
Stability
n-Undecanal is hydrolytically stable. Due to the chemical structure and reactivity of undecanal, there is no abiotic hydrolytic degradation of the substance in aqueous environmental compartments under ambient conditions (GUBDH, 2008).
Biodegradation
n-Undecanal is readily biodegradable failing the 10 -day window (OECD 301B, 65% after 28 d; OXEA, 2010).
Bioaccumulation
At a tonnage level below 100 t/a (information requirements according to REACH Annex VIII), no data on bioaccumulation are required.
Based on the reliable experimentally determined log Kow, BCF was estimated to be 156.6 L/kg wet-wt (28.8 to 851.6 L/kg wet-wt; US EPA BCFBAF v3.01).
n-Undecanal is readily biodegradable (OXEA, 2010). Therefore, the substance is expected to be rapidly biodegraded in the environment and accordingly, environmental concentrations will be very low. Together with the low to moderate BCF, bioaccumulation is not expected to be relevant.
Adsorption/desorption
The organic carbon normalized adsorption coefficient (Koc) was determined within a reliable QSAR study. The key value was determined using the valid (see QMRF) key model "OPERA-model for organic carbon-sorption coefficient" (V1.5) available from the US EPA Chemistry Dashboard. Results were demonstrated to be reliable (see QPRF) and were corroborated by 2 valid supporting models.
Relevant organic carbon normalized adsorption coefficient (Koc):
Koc = 698 L/kg (log Koc: 2.84)
Henry's Law Constant
n-Undecanal is of relevant volatility with respect to environmental waters and moist soil: HLC = 64.3 Pa*m³/mol, 20 °C. The value was estimated from QSAR (Bond Estimation Method, HENRYWIN v3.20) and corroborated via calculation from vapour pressure and water solubility (53.9 Pa*m^3/mol at 20°C).
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