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Environmental fate & pathways

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Transport and distribution:

Adsorption / Desorption potential: For Jessemal the Koc of 760 is derived based on read-across from the close structural analogue Jasmal (CAS# 18871-14-2). For Jasmal, the Koc was tested in an HPLC estimation method according to OECD TG 121 (Rel. 1). The log Koc values of the major components range from 2.42 - 2.88 (Koc: 260 - 760). The log Koc values of the minor components range from 2.37 - 2.51 (Koc ranges from 240 to 320). The Koc of 760 (log Koc 2.88) is reported as key value for chemical safety assessment covering also the higher values.

The Henry's law constantis calculated using the equation from EUSES using a weighted average molecular weight of 226 g/mole, and the experimentally determined (averaged) vapour pressure of 0.38 Pa (at 24 °C) and water solubility of 714.1 mg/L (at 24 °C). The Henry's Law constant at environmental temperature (12 °C) is calculated to be 0.061 Pa·m³/mol. The substance is not expected to volatilise from water to a significant extent.

Based on Level III environmental distribution modellingusing EPISUITE for all constituents (assuming equal and continuous releases to air, water and soil), using the EPISuite default physico-chemical parameters for each constituent as input, it is estimated that the majority of the constituents released to the environment will partition mainly into soil (72%) and water (27%) with minor amounts to air (≤2%) and sediment (<1%) using average values of the two main Cas no. 38285-49 -3and 67634-09 -7, respectively.

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant (STP). Based on the weighted average molecular weight of 226 g/mole, a Koc value of 760 L/kg, a vapour pressure of 0.38 Pa (at 24 °C) and a water solubility of 714.1 mg/L (at 24 °C), and the qualification as readily biodegradable, the model predicts that 81.5% of the substance will be degraded and that 11.9, 6.5%, and 0.024% will partition to water, sewage sludge and air, respectively.

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