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Environmental fate & pathways

Endpoint summary

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Selected physico-chemical parameters and representative for environmental fate

Terpene hydrocarbon alcohols have the followingconstituent types of substances: Solely hydrocarbons-terpene type, Alcohol-type, Ketone-type and Ether-type all having a saturated or unsaturated cyclic hydrocarbon backbone. For Environmental fate, the Solely hydrocarbons present the more extreme values. Based on Terpineolene the Vapour pressure is 51.9 Pa and log Kow is 4.9. For the water solubility the measured of the substance is used to also present the other more water soluble constituent types.

The Koc is calculated to be 11700 L/kg based on the Koc-QSAR for 'predominantly hydrophobics' incorprated in EUSES, with the log Kow of 4.9 as input.

Model input: log Kow = 4.9. The Koc-QSAR 'predominantly hydrophobics' in EUSES was selected: Koc = 1.26*Kow^0.81

The Henry's law constant is calculated using the equation from EUSES. Using a molecular weight of 136 g/mole, and the measured vapour pressure of 51.9 Pa (at 24 °C) and water solubility of 622.5 mg/L (at 24°C), the Henry's Law constant at environmental temperature (12 °C) is calculated to be 5.73 Pa·m³/mol. The substance is expected to limitedly volatilise from water.

Based on Level III environmental distribution modelling using EPISUITE for all constituents (assuming equal and continuous releases to air, water and soil), using the EPISuite default physico-chemical parameters of Terpinolene it is estimated that the majority of the constituents released to the environment will partition mainly into soil (62.7%) and water (35.8%) with minor amounts to sediment (1.4%) and air (<0.1%).

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant (STP). Based on the molecular weight of 136 g/mole, a Koc value of 11700 L/kg, a vapour pressure of 51.9 Pa (at 25 °C) and a water solubility of 622.5 mg/L (at 25 °C), and the qualification as readily biodegradable, the model predicts that 47.5% of the substance will be degraded and that 43.8%, 1%, and 7.75% will partition to sewage sludge, air, and water, respectively.

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