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Environmental fate & pathways

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Partitioning of substances into the different environmental compartments depends mainly on their physico-chemical properties. Since the water solubility of Bis(2-propylheptyl) hexanedioate (DPHA) is very low and the log Pow value high (> 10), the substance is expected to mainly distribute to sediment and soil. However, as DPHA is readily biodegradable according to the OECD criteria, DPHA and its degradation products will not be persistent in the environment. DPHA is not expected to evaporate into the atmosphere due to the low vapor pressure of < 0.00001 Pa at 20 °C. Abiotic hydrolysis is not relevant, since the substance is readily biodegradable and thus expected to be eliminated through biodegradation in natural waters. Additionally, an estimated rate of hydrolysis is low. Based on the rapid environmental biodegradation and metabolism via enzymatic hydrolysis, relevant uptake and bioaccumulation in aquatic organisms is not expected. Enzymatic breakdown will initially lead to the free dicarboxylic acid and the free alcohol. From literature it is well known, that these hydrolysis products will be metabolised and excreted in fish effectively (for detailed information please see chapter 5.3 of technical dossiers). This is supported by low calculated BCF values calculated for DPHA and its transient metabolites (BCF << 2000 L/kg ww; BCFBAF v3.01; Arnot-Gobas, including biotransformation, upper trophic).

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