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Environmental fate & pathways

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One experimental study according to OECD 301F confirmed that Glycerides, C16-18 and C18-unsatd. mono- and di-, citrates (CAS 91052-16-3) is readily biodegradable according to the OECD criteria (81% biodegradation after 28 d). The degradation via abiotic hydrolysis is not considered to be a relevant degradation pathway in the environment since the substance is readily biodegradable. Considering the low water solubility (1.86E-37 to 1.2721 mg/L based on QSAR) of Glycerides, C16-18 and C18-unsatd. mono- and di-, citrates and strong potential for adsorption to organic soil and sediment particles (log Koc: > 5), the main compartments for environmental distribution are expected to be soil and sediment. Only one component shows a low potential for adsorption with a log Koc of 2.51. However, persistency is not expected since the substance is readily biodegradable. Moreover, the release of the substance to the environment after passing through conventional Sewage Treatment Plants (STPs) is expected to be low. The Guidance on information requirements and chemical safety assessment, Chapter R.7b (ECHA, 2016) 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, 2015). Thus, discharged concentrations of this substance into the aqueous/sediment and soil compartment (via water) are likely to be (if at all) low. Evaporation from the water phase into air and transport through the atmospheric compartment is not expected in significant amounts based on the low vapour pressure of ≤ 0.001 Pa at 20 °C. Therefore, the potential for accumulation in air and the subsequent transport to other environmental compartments is low. The potential for bioaccumulation of Glycerides, C16-18 and C18-unsatd. mono- and di-, citrates is assumed to be low based on the calculated BCF values ranging from 0.893 - 34.1 L/kg (BCFBAF v3.01).

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