Registration Dossier
Registration Dossier
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EC number: 200-839-4 | CAS number: 75-10-5
Endpoint summary
Administrative data
Description of key information
In water, difluoromethane is not dissociated and not expected to hydrolyse owing to the lack of hydrolysable functional groups in its chemical structure. Although the limited experimental data show that difluoromethane is poorly degraded in aquatic environments (5% after 28 days; OECD 301D), it is unlikely that the test substance stays in aqueous waste streams discharged directly into rivers or lakes, as it is expected to have a volatilisation half-life of few days. A calculation with EpiWin software (US-EPA, 2009) suggests volatilisation half-lives of about 45 minutes for rivers and 69 hours for lakes.
Volatilization from Water:
Henry LC: 0.292 atm-m3/mole (estimated by Bond SAR Method)
Half-Life from Model River: 0.7374 hours (44.25 min)
Half-Life from Model Lake : 68.52 hours (2.855 days)
Moreover, difluoromethane is not expected to sorb significantly to soils and sediments, nor to bioaccumulate in aquatic species, due to its low potentials for adsorption and bioaccumulation based on a measured log Kow of 0.21.
Difluoromethane, when released to the environment, will partition almost exclusively into the air; it has little tendency to partition to aquatic and terrestrial compartments. Because of its low sorption potential, difluoromethane is expected to be mobile in soil. The most significant degradation process occurs in the atmospheric compartment.
Additional information
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