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Environmental fate & pathways

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Bromochloromethane is expected to exist solely as a vapour in the atmosphere due to its vapour pressure of 142 mm Hg at 25 ºC. In the atmosphere it will be degraded by reaction with hydroxyl radicals. The estimated atmospheric half-life using EPI-Suite is of 107.63 days. In the study carried out by Wuebbles, DJ et all. it is reported an atmospheric lifetime of 0.4 years. Special attention should be given to its impact on the ozone layer, as bromochloromethane is considered an ozone depleting substance, on the basis of its Ozone Depletion Potential of 0.11 -0.13.

If released to soil, bromochloromethane is expected to have very high mobility, on the basis of the estimated Koc value of 21.73. The estimated Henry's Law constant of 0.00299 atm · m3/mole esteem that volatilization from moist soil surfaces is an important fate process. Based on its vapour pressure, bromochloromethane is expected to volatilize from dry soil surfaces.

If released to water, the estimated Koc value of 21.73 indicates that bromochloromethane will not adsorb to suspended solids and sediment. On the basis of the estimated Henry's Law constant of 0.00299 atm · m3/mole, volatilization from water surfaces is expected. An estimated Bioaccumulation Factor (BCF) of 3.957 l/kg wet-wt suggests a low potential for bioconcentration in aquatic organisms. Results from a scientific article suggest that biodegradation could be relevant to aquatic fate.