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Environmental fate & pathways

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Transport and distribution

Koc: The determined Koc value of 417 (log Koc 2.62) (HPLC, OECD TG 121) indicates that the substance will have a low potential to adsorb to sediment/soil (< 500).

Henry's law constant: To assess the volatilisation potential of the substance a Henry's law constant was calculated which showed a value of 2.44 Pa.m3/mol at 25°C. This value is used in distribution modelling and shows that volatilisation only plays a minor role in the environmental behaviour of Cyclacet.

Based on Level III distribution modelling using EPISUITE(assuming equal and continuous releases to air, water and soil) using the CAS number 54830-99-8 and the measured physico-chemical parameters as input, it is estimated that the majority of the substance released to the environment will partition mainly into soil (75%) and water (24%) with small amounts to sediment and air (both <1%).

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant based on vapour pressure, water solubility, log Kow and (non) ready biodegradability. The model predicts that 93% of the substance will partition to water, 5% to sewage sludge and 2% to air at 12°C.

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